This is something I've always wanted to understand, and already at 12:00 minutes in I have a much better understanding of this phenomenon than ever before. Also, Grant, your animations were already excellent like 5 years ago, but these are on an entirely new level. I'm so excited for the rest of this video!
I am so happy that you've decided to cover this topic. Has never quite clicked with me and I knew that I've been waiting for someone to really decode it in an easy to explain way
This is the most beautiful hologram class I ever have. 30 years ago, I produced my first hologram in the optics lab of the university. It was a real magic, but to this artwork, I only catched very fuzzy realizations from the vector equations in my textbook. That was an era without internet and youtube video. Thank 3b1b, guys that helps production this video, and the astonishing IT technology, to give me such a deep and visualized unstanding on hologram!
I have been curious about this process since highschool but couldn't really grasp it even with videos explaining it, so I am glad you are covering this topic without complicating everything with terminology. Thanks! More of this type of content please. Well. Not holograms specifically, but y'know.
11:39 This feels like it would make an incredible element in an escape room. Have a table set up, and to solve the puzzle you need to find these chips with different scenes recorded on them at the same table
I didn't imagine you would do an episode on holograms! Not only that, but you found the two exact holograms and features to be the most mindboggling as I did: any sort of glassware or lens in a scene, and a hologram of a microscope! Seeing these concepts explained with your animations is super helpful, especially the phase aspect. I would see it mentioned in explanations but wasn't sure how it was involved and I felt the interference argument alone was sufficient to understanding. The explanation about diffraction gratings and the various orders of light beams that they produced, answering how each affect things and why the others don't occur was excellent! I was thinking "but what about the other beams??" You're right about the complex number argument being "unsatisfying" on its own. But as an addendum to everything that preceded it in this video, it's a great cherry on top for completeness! The fact that the 2D plane containing the object wave in space _also_ projects that information out in 3D space doesn't seem as bizarre. That intuition doesn't make me feel certain that it's definitely the case (even though it is), but it also doesn't make me completely baffled as to why it is. Even though the reason why that is is a lot more complex. It feels like there's not much else it _could_ do besides travel out through 3D space in the same manner that the light reflecting off the scene originally did. But it feels like that intuition is still missing a lot more which is probably why that part would be a lot more complicated! Also, microfilm I see used resolves around 800 lp/mm (Fuji HR-21 or ADOX CMS 20) and they're kind of fun to use for regular photography because then you can quite realistically get 200MP+ from 35mm film. On the upper end of its resolving power you can get a gigapixel or more, that's why there was this one film developed called "gigabitfilm". 100-200lp/mm is well within the range of almost all professional films, color, black and white, slides or negatives. This video was totally awesome! Even since I saw that "Introduction to Holography" educational film you included and it showed how recording into the depth of the film had significance, that optics in a scene still "work", that you scan store multiple "channels", etc made holograms seemed like pure magic! That's why your video was so perfect to me!
How could you increase the quality of your work all the time. This video was like a snapshot of a whole optics curriculum which I could never felt the grasp until now. You are really putting in a brilliant use of computers. Wonderful work.
What I love about holography is that at its core, it's an application of the principles of diffraction and interference, some basic high-school level physics principles.
thank you so much Grant and team for making this nobel prize discovery to be so digestible for the average physics enthusiasts. Seriously, from the bottom of my heart, thank you so much for the work you do.
By the way, your ability to understand how to translate reality (math) into an understanding of symbolic mathematical representation is astounding. I applaud your endeavors.
I really like this style of explaining almost every concept necessary, but making it easy to skip over a part if your familiar with the concept beforehand. Really good video!
I accually wrote my bachelor thesis half a year ago about optimising computer generated holograms for digital hologram displays. I was looking for an intuitive explanation for holograms in general and didn't find it. until right now. Also I know how difficult it is to explain this topic and you did an excelent job.
Mind blown! Thank you! What I find ultra facinating here, that we get to jump a dimention: We get a 3D image from a 2D source, and we don't break physics! The next "step" would be to pull the 4th dimention from 3D objects. Imagine having some technique / device that views the Klein bottle in 4D... I remember in the early '90's a hologramic video game, but that is not the same as this. As an electronics engineer (with the focus on the engineer part), I found this ultra-facinating. Additionally, I work for a company that produces telescopes (mounted in satellites to observe earth). Although I'm not directly involved in optics, it is good to know some of the theories.
You seem to have this amazing knack for finding stuff I kind of thought I knew about already and exploring an entire additional layer of fascinating depth for it. Loving these sciencey themed videos!
Your YT channel is magical tbh. Any sufficiently advanced technology seems like magic, and I can't fully grasp most of your concepts. To a dummy like me you might as well be using magic and some fancy numbers to gaslight me into thinking I'm dumb.
This is somehow more magical now that I know how it works. Literally brings tears to my eyes. Also explains the statement I've heard that the universe could be explained as a hologram of a higher dimensional space. Amazing. Thank you ❤
Such an interesting subject and articulate explanation. Makes one want to learn more. Unlike my university. You are the true epitome of a real teacher. Thanks man
To anyone that saw The Thought Emporium's recent video on diffraction gratings, notice that the holographic exposure pattern for the theoretical single point hologram is just like the grating he used to focus light using only diffraction.
7:42 it might not be clear for most people why recording the phase of the light wave is relevant to record a 3d image on a 2d plane, but, being a physicist I will give a shot before watching the rest of the video. A point in a 3d object reflects light in all directions, so the light from that single point will essentialy hit all points of the film, but the distance between that point and the ones in the film will be different, therefore the time they will be hit is different, therefore the phase of the light that will initially hit each place will also be different. If you can record said phase you will have a vague record of the distance between each point of the film and the target point. If this effect is applied to every point in the 3D object, the sum of all the information may indeed create the ilusion of looking through a window. This would honestly be best explained with an animation (if I am even correct). I hope this is what the video has in store!
Interference patterns are mesmerizing. When we did this in high school in the 80s with support from the local university (famous for its optical engineering major), we got to make some very interesting holograms of D&D dice and a few hundred other random trinkets. I always dreamed of someone eventually producing a display that could dynamically reproduce the pattern. Maybe some day
This was an excellent video explanation of how holography works. Thank you. It also raises questions about how phased array radars work, and beam forming in general. I hope for a follow on that looks at this. Again, thank you for explaining this so well.
the formal explanation is so satisfying 🫠 i just learned about complex numbers in my 5th math lecture of the chemistry precourse and were a week ago and were thereby able to understand everything 🎉 it’s amazing how much you can do with this comparably simple math😮
The interference from tiny shifts in the movement of the room reminds me of analogous problems that can occur when recording audio using the Mid-Side audio recording/mixing technique. To set it up, get two mics: one cardioid or omni-directional, normally positioned, and the other "figure-8", positioned below the first, aiming perpendicular to the sound source; duplicating the off-axis recording while also reversing the polarity of the duplicate. This gives 3 tracks (Mic1, Mic2, Mic2inverted). As you increase the volume on the duplicates in relation to the primary audio signal, the stereo width of the output is increased. Problems with interference (comb-filtering in this case) become very apparent when say, a singer moves their head when singing. Some interference is inevitable and not so bad: it's a great technique for recording big things that don't move. Like Pianos.
Stunning video quality. I've always been fascinated by holograms, and this video made them a lot more clear for my unprepared mind. Thank you very very much for what you do!
This is the coolest thing ever! Explained in the best way possible! This video was so fascinating and amazing! I was blown away so many times! Thank you so much!
11:50 That "little piece" demo reminds me of a TV show I saw as a kid. I suppose it must have been an episode of _NOVA_ since there wasn't much like that available -- if not, it must have been a one-off on PBS, possibly taken from the British Horizon. Here it was a huge extremely deep hologram of an exhibit of warships, that gets knocked over and shattered. The narrator continues, "left to pick up the pieces..." and shows how each piece contains the entire scene.
I always get lost at the topology stuff, but for some reason, this is the easiest thing I ever learnt... in fact, his wording of the setup in the start was enough for me to be able to imagine how the hologram works
Imagine how crazy it would be if this kind of holographic projection could be used in videos on phones and TV screens. It can be simulated with VR/AR, but to actually have this built into the screen would be nuts.
These holograms remind me very much of NeRFs (Neural Radiance Fields). They seem to have the same properties as (transmission) holograms (=> light reflecting, diffracting, ... similarly) I would love a video on NeRFs in general! It feels like the concept of NeRFs is very closely related to holograms.
There are copies of that microscope hologram in museums around the world. Experienced it for myself in London (I think it was the Science Museum) many years ago. Really cool looking through the lens of the microscope.
I would love to have this video just 3 months ago. I had to present on my class about holograms. They are really beautiful, and much more interesting than volumetric displays (what most people think holograms are). It went good for me, but just having that mathematical part would have been amazing :)
~30:40 It's like the beam's order being the resulting frequency bumps of a fourier transform. Sine-like gradient slits can produce only the 1st order (the 0th being always the equivalent of DC 0hz on fourier). Square-like slits produce more orders, as their shaping is composed by many "sine-like gradient slits stacked"
I have made several attempts to get a 10,000 ft understanding of this before and failed. I had to pause your video ten minutes in when it suddenly clicked - i paused again later when i realised the film itself acts as a diffraction grating, Many thanks - i now have enough understanding to be able to explain it in vague terms to someone else.
What i didnt understand in the point reconstruction was , that in the diffusion equation we mentioned a huge number of these slits together form a bright beam at the angle theta , but when you did it for the 2d film you assumed this "Bright beam" to be forming off just one of the slits (from the pattern on the film) which seems non-obvious , if say a collection of these slits were taken into account to give this reflection of object wave of the point (the first order beam that makes the hologram) , then it would mean near the edges of the boundary it would fail to recreate this first order beam and henceforth breaking the hologram when viewed from the edges.
In high school, my physics teacher told us the story of interviewing candidates for another teacher for physics at the school. One of the last steps is to teach a sample lesson. Most choose optics because it's the simplest to teach self contained. One of the other teachers pretending to be a student asked how a hologram worked. The candidate asked to mock student to try ti figure it out. As our teacher explained, that's generally a good technique in high school level physics question, but holograms are not high school level and what he demonstrated was that he didn't know how it worked. That would have been fine if he just said he didn't know. But he pretend he knew and made the mock student frustrated for being unable to figure it out. He didn't get the job.
26:09 if u were wondering x/L should be tanθ, u r right, but x/L is very small here (we equating it to wavelength, that small) almost tending to zero, and if tanθ tends to zero, it is equal to θ itself and luckily that is also true for sinθ....so that's why, sinθ.....
Another old system that was underappreciated and unsupportable was the Fujifilm 3W camera. I printed several Fresnel lens prints from it. But the images were incredible. Yes, only two point images, but sufficient to construct the amazing 3D effect.
Holograms were everywhere in the 90s as fun curios, I went out to get new ones and since people mostly use the sci fi term now, and they are less popular, it's much harder than it used to be unfortunately.
One last comment would be about the Hololens from Microsoft. Or Magic Leap or any wavefront device (There are now many now) that project into your mixed reality view of real imagery alongside encoded visual data. It's all part of this discussion, but more importantly, it key to how all these systems work.
There's a lot of overlap with principles of particle interactions and holography. Definitely helped me have more insight into how quantum mechanical interactions may actually work. 🤯 I'd also love to understand how Gaussian Splatting ties into radiance and light fields and if there are any overlapping ideas there.
Lyrtro used to make a light field camera, and it is an interesting gimmick - can pan/tilt and change depth of field etc after the fact. At one point they made a cinema room scale camera, but I dont think it went anywhere publicly for usage and such. How much was just clever software, I'm not sure, but the creator is now onto making actual full size holograms now at light field lab.
Usually the videos explaining holograms end at explaining the recording process. This legend even explained how to construct that hologram pattern. Now I wonder if we could ever computer generate those patterns in realtime on LCD (though it seems the computing power and resolution would have to be orders of magnitudes above our current capabilities). Also is it possible to combine R and G and B holgrams to create a colored hologram for the human eye when iluminated with R and G and B lasers? If the hologram recording could be generated in realtime, then I guess it could be done by swithing the RGB pattern renders and RGB lasers in time at triple the FPS frequency to blend them together via persistence of vision. If all of this turns out to be possible, that could make up for some awesome holographic displays in the far future.
If I'm understanding this video right, in order to create a hologram we'd need to create pixels as small as the wavelength of light, as we need to recreate that diffraction pattern. That would also mean we'd need an enormous amount of computing power to create the pattern itself, as well as just displaying the sheer amount of pixels needed. It'll be possible someday I'm sure, but we're still a ways away.
Passion of my youth time...😊 when light difracting stucture of 10.000 lines per mm and concurrent posdibility of rerecording/changing its stucture 25 or more times per sec will be created - we'll get the holographic movie screening
![[UNCUT] “บอสณวัฒน์” ลากไส้!! ใครหนุนหลัง "แม่ตั๊ก ป๋าเบียร์" I คนดังนั่งเคลียร์ I 30 ก.ย. 67](http://i.ytimg.com/vi/QlD7mU2KKRk/mqdefault.jpg)
Still can't help but being blown away by the quality in these videos...
bro watched the entire video in 3 minutes
@@ThatShushi17-mc7ct Jokes on you, I didn't watch at all💀
Fresh 3 blue 1 brown video to savour on a Saturday, dosent get much better
3B1B is actually the best educational channel on TH-cam
This is something I've always wanted to understand, and already at 12:00 minutes in I have a much better understanding of this phenomenon than ever before. Also, Grant, your animations were already excellent like 5 years ago, but these are on an entirely new level. I'm so excited for the rest of this video!
I am so happy that you've decided to cover this topic. Has never quite clicked with me and I knew that I've been waiting for someone to really decode it in an easy to explain way
This is the most beautiful hologram class I ever have. 30 years ago, I produced my first hologram in the optics lab of the university. It was a real magic, but to this artwork, I only catched very fuzzy realizations from the vector equations in my textbook. That was an era without internet and youtube video. Thank 3b1b, guys that helps production this video, and the astonishing IT technology, to give me such a deep and visualized unstanding on hologram!
I have been curious about this process since highschool but couldn't really grasp it even with videos explaining it, so I am glad you are covering this topic without complicating everything with terminology. Thanks! More of this type of content please. Well. Not holograms specifically, but y'know.
11:39 This feels like it would make an incredible element in an escape room. Have a table set up, and to solve the puzzle you need to find these chips with different scenes recorded on them at the same table
Already implemented in a video game called The Room
I refreshed youtube and was like wtf 2 seconds ago ! Always a pleasure seeing one of your vids pop up on my feed!
I didn't imagine you would do an episode on holograms! Not only that, but you found the two exact holograms and features to be the most mindboggling as I did: any sort of glassware or lens in a scene, and a hologram of a microscope!
Seeing these concepts explained with your animations is super helpful, especially the phase aspect. I would see it mentioned in explanations but wasn't sure how it was involved and I felt the interference argument alone was sufficient to understanding.
The explanation about diffraction gratings and the various orders of light beams that they produced, answering how each affect things and why the others don't occur was excellent! I was thinking "but what about the other beams??"
You're right about the complex number argument being "unsatisfying" on its own. But as an addendum to everything that preceded it in this video, it's a great cherry on top for completeness! The fact that the 2D plane containing the object wave in space _also_ projects that information out in 3D space doesn't seem as bizarre. That intuition doesn't make me feel certain that it's definitely the case (even though it is), but it also doesn't make me completely baffled as to why it is. Even though the reason why that is is a lot more complex.
It feels like there's not much else it _could_ do besides travel out through 3D space in the same manner that the light reflecting off the scene originally did. But it feels like that intuition is still missing a lot more which is probably why that part would be a lot more complicated!
Also, microfilm I see used resolves around 800 lp/mm (Fuji HR-21 or ADOX CMS 20) and they're kind of fun to use for regular photography because then you can quite realistically get 200MP+ from 35mm film. On the upper end of its resolving power you can get a gigapixel or more, that's why there was this one film developed called "gigabitfilm". 100-200lp/mm is well within the range of almost all professional films, color, black and white, slides or negatives.
This video was totally awesome! Even since I saw that "Introduction to Holography" educational film you included and it showed how recording into the depth of the film had significance, that optics in a scene still "work", that you scan store multiple "channels", etc made holograms seemed like pure magic! That's why your video was so perfect to me!
a 45 min 3b1b video?!! I don't know what good deed I
did to deserve this.
When the world needed him the most...he turned up!
Great work Grant, your explanations and animations are truly next level!
i first thought its another video from sebastian lague about his 3d renderer. holograms are a neat idea to implement.
17:06: "Let's take a side-step into a mini-lesson so I don't have to rob you of that joy."
lol, I love it! Never change, Grant!
Words are not enough to express how much I adore this channel.
How could you increase the quality of your work all the time. This video was like a snapshot of a whole optics curriculum which I could never felt the grasp until now. You are really putting in a brilliant use of computers. Wonderful work.
What I love about holography is that at its core, it's an application of the principles of diffraction and interference, some basic high-school level physics principles.
I remember first coming across it in Stephen Hawking's book, Universe in a Nutshell.
It can’t get better than this for a great start for the weekend. Thank you Sir.
Amazing video! As someone who works in holography in the lab, this explanation helped me a lot!
thank you so much Grant and team for making this nobel prize discovery to be so digestible for the average physics enthusiasts. Seriously, from the bottom of my heart, thank you so much for the work you do.
The best video to coherently explain the magics of hologram I believe ever!
A while ago I was learning about the theory of the universe being a 2 dimensional hologram, this helps me visualize!
30:37 My first thought was harmonics. Like a radio wave that is a sine does not create harmonics, but a square wave does.
By the way, your ability to understand how to translate reality (math) into an understanding of symbolic mathematical representation is astounding. I applaud your endeavors.
3B1B you have single handedly reignited my love for math and knowledge in general. Thank you.
I really like this style of explaining almost every concept necessary, but making it easy to skip over a part if your familiar with the concept beforehand. Really good video!
please continue the serie of probability
and the machine learning serie
series*
@@fullfungo wow...i really suck at english
I accually wrote my bachelor thesis half a year ago about optimising computer generated holograms for digital hologram displays.
I was looking for an intuitive explanation for holograms in general and didn't find it. until right now.
Also I know how difficult it is to explain this topic and you did an excelent job.
Mind blown! Thank you!
What I find ultra facinating here, that we get to jump a dimention: We get a 3D image from a 2D source, and we don't break physics! The next "step" would be to pull the 4th dimention from 3D objects. Imagine having some technique / device that views the Klein bottle in 4D...
I remember in the early '90's a hologramic video game, but that is not the same as this. As an electronics engineer (with the focus on the engineer part), I found this ultra-facinating. Additionally, I work for a company that produces telescopes (mounted in satellites to observe earth). Although I'm not directly involved in optics, it is good to know some of the theories.
You seem to have this amazing knack for finding stuff I kind of thought I knew about already and exploring an entire additional layer of fascinating depth for it. Loving these sciencey themed videos!
Your YT channel is magical tbh. Any sufficiently advanced technology seems like magic, and I can't fully grasp most of your concepts. To a dummy like me you might as well be using magic and some fancy numbers to gaslight me into thinking I'm dumb.
Finally think I somewhat understand how this works. Blown away by the quality of this video!
This is somehow more magical now that I know how it works. Literally brings tears to my eyes.
Also explains the statement I've heard that the universe could be explained as a hologram of a higher dimensional space.
Amazing. Thank you ❤
3Blue1Brown just called me "rather clever" and this unironically made my entire day.
25:02 Cool tattoos, just like the inscription on the Voyager satellite Golden records.
Such an interesting subject and articulate explanation. Makes one want to learn more. Unlike my university. You are the true epitome of a real teacher. Thanks man
To anyone that saw The Thought Emporium's recent video on diffraction gratings, notice that the holographic exposure pattern for the theoretical single point hologram is just like the grating he used to focus light using only diffraction.
Probably my favourite video of yours so far. So incredibly well explained at such a good pace!
Wow! Such complex topic explained so simple.
7:42 it might not be clear for most people why recording the phase of the light wave is relevant to record a 3d image on a 2d plane, but, being a physicist I will give a shot before watching the rest of the video.
A point in a 3d object reflects light in all directions, so the light from that single point will essentialy hit all points of the film, but the distance between that point and the ones in the film will be different, therefore the time they will be hit is different, therefore the phase of the light that will initially hit each place will also be different. If you can record said phase you will have a vague record of the distance between each point of the film and the target point. If this effect is applied to every point in the 3D object, the sum of all the information may indeed create the ilusion of looking through a window. This would honestly be best explained with an animation (if I am even correct). I hope this is what the video has in store!
Interference patterns are mesmerizing. When we did this in high school in the 80s with support from the local university (famous for its optical engineering major), we got to make some very interesting holograms of D&D dice and a few hundred other random trinkets. I always dreamed of someone eventually producing a display that could dynamically reproduce the pattern. Maybe some day
This was an excellent video explanation of how holography works. Thank you. It also raises questions about how phased array radars work, and beam forming in general. I hope for a follow on that looks at this.
Again, thank you for explaining this so well.
the formal explanation is so satisfying 🫠
i just learned about complex numbers in my 5th math lecture of the chemistry precourse and were a week ago and were thereby able to understand everything 🎉
it’s amazing how much you can do with this comparably simple math😮
The interference from tiny shifts in the movement of the room reminds me of analogous problems that can occur when recording audio using the Mid-Side audio recording/mixing technique. To set it up, get two mics: one cardioid or omni-directional, normally positioned, and the other "figure-8", positioned below the first, aiming perpendicular to the sound source; duplicating the off-axis recording while also reversing the polarity of the duplicate. This gives 3 tracks (Mic1, Mic2, Mic2inverted). As you increase the volume on the duplicates in relation to the primary audio signal, the stereo width of the output is increased. Problems with interference (comb-filtering in this case) become very apparent when say, a singer moves their head when singing. Some interference is inevitable and not so bad: it's a great technique for recording big things that don't move. Like Pianos.
This was crazy good, super insightful, extremely well-made, and spaced in a followable clearly structured way!! Thanks! ❤
Stunning video quality. I've always been fascinated by holograms, and this video made them a lot more clear for my unprepared mind. Thank you very very much for what you do!
I've been waiting for you to cover holography, thanks so much Grant!
I have created my own transmission and reflection holograms here at home.
Thank you for uploading on my birthday. Been watching since learning calculus and your videos really made it seem like something I can learn 😊
This was great! It feels like this may also relate to the “magic eye” pictures.
This is the coolest thing ever! Explained in the best way possible! This video was so fascinating and amazing! I was blown away so many times! Thank you so much!
11:50 That "little piece" demo reminds me of a TV show I saw as a kid. I suppose it must have been an episode of _NOVA_ since there wasn't much like that available -- if not, it must have been a one-off on PBS, possibly taken from the British Horizon.
Here it was a huge extremely deep hologram of an exhibit of warships, that gets knocked over and shattered. The narrator continues, "left to pick up the pieces..." and shows how each piece contains the entire scene.
I always get lost at the topology stuff, but for some reason, this is the easiest thing I ever learnt... in fact, his wording of the setup in the start was enough for me to be able to imagine how the hologram works
the conclusion is just wow❤
Imagine how crazy it would be if this kind of holographic projection could be used in videos on phones and TV screens. It can be simulated with VR/AR, but to actually have this built into the screen would be nuts.
wow I was researching about holograms yesterday. Such a good timing, ty.
At the Getty, a free museum here in Los Angeles, Matthew Schreiber has a whole exhibit of these very masterfully made holographs
one of the best youtube videos i have ever seen
These holograms remind me very much of NeRFs (Neural Radiance Fields). They seem to have the same properties as (transmission) holograms (=> light reflecting, diffracting, ... similarly)
I would love a video on NeRFs in general! It feels like the concept of NeRFs is very closely related to holograms.
There are copies of that microscope hologram in museums around the world. Experienced it for myself in London (I think it was the Science Museum) many years ago.
Really cool looking through the lens of the microscope.
This endless desire i have for knowledge, i wish i had all the time in the universe to satisfy it.
OMG! thank you 3b1b! I love how you make us fall in love with math and science! OK now for a great video ahead!!
Impressive, very nice. Let's see Paul Allen's video on holograms.
First time see fresh 3b1b video, I'm happy
I am a simple man. I see 3b1b video, I click.
We need more simple men like you
I would love to have this video just 3 months ago. I had to present on my class about holograms. They are really beautiful, and much more interesting than volumetric displays (what most people think holograms are). It went good for me, but just having that mathematical part would have been amazing :)
~30:40 It's like the beam's order being the resulting frequency bumps of a fourier transform. Sine-like gradient slits can produce only the 1st order (the 0th being always the equivalent of DC 0hz on fourier). Square-like slits produce more orders, as their shaping is composed by many "sine-like gradient slits stacked"
I think you should consider notifying the "Huygens optics" youtube channel of your video, I am positive they will enjoy it.
I have made several attempts to get a 10,000 ft understanding of this before and failed. I had to pause your video ten minutes in when it suddenly clicked - i paused again later when i realised the film itself acts as a diffraction grating, Many thanks - i now have enough understanding to be able to explain it in vague terms to someone else.
The best explanation of holography， thank you!
I'm sorry but that's the coolest damn thing I've ever seen
I have hacker cup in 1 hr + my modern algebra test tomorrow morning and I need to study for it , but surely this seems more important and interesting.
Grant can you please make a video on topologies and the maths related to it?
You have sufficiently exploded my mind for today
This is the best video on youtube. wow
What i didnt understand in the point reconstruction was , that in the diffusion equation we mentioned a huge number of these slits together form a bright beam at the angle theta , but when you did it for the 2d film you assumed this
"Bright beam" to be forming off just one of the slits (from the pattern on the film) which seems non-obvious , if say a collection of these slits were taken into account to give this reflection of object wave of the point (the first order beam that makes the hologram) , then it would mean near the edges of the boundary it would fail to recreate this first order beam and henceforth breaking the hologram when viewed from the edges.
Incredibly beautiful explanation!
In high school, my physics teacher told us the story of interviewing candidates for another teacher for physics at the school. One of the last steps is to teach a sample lesson. Most choose optics because it's the simplest to teach self contained. One of the other teachers pretending to be a student asked how a hologram worked. The candidate asked to mock student to try ti figure it out.
As our teacher explained, that's generally a good technique in high school level physics question, but holograms are not high school level and what he demonstrated was that he didn't know how it worked. That would have been fine if he just said he didn't know. But he pretend he knew and made the mock student frustrated for being unable to figure it out.
He didn't get the job.
This is one of your greatest videos
Incredible video man
everyone is just dropping bangers today
This one is just unbelievably good!
25:10 That is a cool as heck tattoo, my favourite unit of length!
26:09 if u were wondering x/L should be tanθ, u r right, but x/L is very small here (we equating it to wavelength, that small) almost tending to zero, and if tanθ tends to zero, it is equal to θ itself and luckily that is also true for sinθ....so that's why, sinθ.....
Hell Yeah. This day just got a whole lot better
All uploaded today just under 2 hrs veritasium, 3 blue 1 brown, real engineering
Ahhh what a day today
Yeah true
Yep, amazing content to watch today
Another old system that was underappreciated and unsupportable was the Fujifilm 3W camera. I printed several Fresnel lens prints from it. But the images were incredible. Yes, only two point images, but sufficient to construct the amazing 3D effect.
Finally I found out what serendipity means. And I wasn't even looking for that when I was clicking this video!
Holograms were everywhere in the 90s as fun curios, I went out to get new ones and since people mostly use the sci fi term now, and they are less popular, it's much harder than it used to be unfortunately.
Another masterpiece. You're amazing, Grant!!
One last comment would be about the Hololens from Microsoft. Or Magic Leap or any wavefront device (There are now many now) that project into your mixed reality view of real imagery alongside encoded visual data. It's all part of this discussion, but more importantly, it key to how all these systems work.
Today is a genuinely lucky day! Ben uploaded an hour ago, and just 15 minutes later, grant did.
I feel spoilt
There's a lot of overlap with principles of particle interactions and holography. Definitely helped me have more insight into how quantum mechanical interactions may actually work. 🤯
I'd also love to understand how Gaussian Splatting ties into radiance and light fields and if there are any overlapping ideas there.
The thought emporium is working on home holography. This goes pretty damn well with that project.
Lyrtro used to make a light field camera, and it is an interesting gimmick - can pan/tilt and change depth of field etc after the fact. At one point they made a cinema room scale camera, but I dont think it went anywhere publicly for usage and such. How much was just clever software, I'm not sure, but the creator is now onto making actual full size holograms now at light field lab.
3b1b is back with the physics content
Usually the videos explaining holograms end at explaining the recording process. This legend even explained how to construct that hologram pattern. Now I wonder if we could ever computer generate those patterns in realtime on LCD (though it seems the computing power and resolution would have to be orders of magnitudes above our current capabilities). Also is it possible to combine R and G and B holgrams to create a colored hologram for the human eye when iluminated with R and G and B lasers? If the hologram recording could be generated in realtime, then I guess it could be done by swithing the RGB pattern renders and RGB lasers in time at triple the FPS frequency to blend them together via persistence of vision. If all of this turns out to be possible, that could make up for some awesome holographic displays in the far future.
If I'm understanding this video right, in order to create a hologram we'd need to create pixels as small as the wavelength of light, as we need to recreate that diffraction pattern. That would also mean we'd need an enormous amount of computing power to create the pattern itself, as well as just displaying the sheer amount of pixels needed. It'll be possible someday I'm sure, but we're still a ways away.
This is going to unlock the next level of Haunted House Tours. Unbelievable!
Holograms are one of the most amazing discovery of mankind, it will slowly replace screens completely
Passion of my youth time...😊
when light difracting stucture of 10.000 lines per mm and concurrent posdibility of rerecording/changing its stucture 25 or more times per sec will be created - we'll get the holographic movie screening
@ 15:46 this reminded me of Newtonrings! 👍😉