How Does a Laser Work? Quantum Nature of Light - [3]
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- เผยแพร่เมื่อ 4 ก.ค. 2024
- More Lessons: www.MathAndScience.com
Twitter: / jasongibsonmath
In this lesson, you will learn how lasers work. We begin that laser stands for light amplification by stimulated emission of radiation. We discuss how stimulated emission of photons differ from spontaneous emission of photons. Next, we discuss the energy levels that electrons occupy in the region surrounding the atom, and outline how we can calculate the energy of released photons when an electron decays from a higher energy to a lower energy state using plank's relation for the energy of a photon. Next, we discuss that in order to make a laser, we need a population inversion of electrons in a higher metastable state, that then decay into a lower state when a photon stimulates the emission of a new photon in the lasing medium. Finally, we discuss how to construct an optical resonant cavity, where the photons can reflect and amplify the emission of photons, which can then exit the device as a collimated, coherent, monochromatic source of light - laser light.
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No need to apologise, I wouldn’t mind if it was longer! Interesting and informative, thank you. I’m looking forward to what’s next.
Thank you Paul!
Trust me you did an amazing job of explaining a very complicated topic in simple language that made it clear and easy to understand. Moreover the explanation was so engrossing the time frame was irrelevant…one of the reasons I love TH-cam, turns out there are smart people who can explain the genius of mankind in a simple intuitive way!
Thank you Richard! I appreciate it!
Agree with you 100 percent. I was so drawn in and enjoying it so much, that time didn't matter. Best description I've see for LASERs.
@@MathAndScience The following CLEARLY, necessarily, and mathematically proves what is the fourth dimension (ON BALANCE).
WHAT IS E=MC2 is consistent with what is TIME. WHAT IS E=MC2 is dimensionally consistent. WHAT IS E=MC2 is taken directly from F=ma, AS the rotation of WHAT IS THE MOON matches the revolution; AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). c squared CLEARLY represents a dimension of SPACE ON BALANCE. INDEED, consider WHAT IS THE EYE ON BALANCE. Great. Consider TIME AND time dilation ON BALANCE. Great.
WHAT IS E=MC2 is taken directly from F=ma, AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE); AS the rotation of WHAT IS THE MOON matches the revolution. The stars AND PLANETS are POINTS in the night sky ON BALANCE. c squared CLEARLY represents a dimension of SPACE ON BALANCE. Consider TIME AND time dilation ON BALANCE. Great.
TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE); AS the rotation of WHAT IS THE MOON matches the revolution; AS WHAT IS E=MC2 is taken directly from F=ma; AS gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE; AS “mass”/ENERGY involves BALANCED inertia/INERTIAL RESISTANCE consistent WITH/AS what is BALANCED electromagnetic/gravitational force/ENERGY; AS inertia/INERTIAL RESISTANCE is proportional to (OR BALANCED WITH/AS) what is gravitational force/ENERGY. INDEED, witness what is the fully illuminated (AND setting/WHITE) MOON ON BALANCE. WHAT IS GRAVITY is an INTERACTION that cannot be shielded or blocked ON BALANCE. (BALANCE AND completeness go hand in hand.) GREAT.
By Frank Martin DiMeglio
I have theory that we can all understand almost anything IF it's explained in the right way. You did a brilliant job. Sure you could make it shorter, but you'd end up with an explanation where we are wishing we could ask questions.
Thank you so much!
Of course things are explained in the right way in schools and universities or how else are people going about their jobs? Theory? Hmm
@@oo0Spyder0oo maybe they learn 'in spite' of how they're taught, not 'because' of it?
You are a national treasure! I wish your lectures were piped into every school in the US/world.
Thank you so much! I’d love that as well!
@@MathAndScience Physics/physical experience is not very well understood in general. Neither is what is time.
The top down understanding of physics/physical experience is very lacking. Consider what is E=MC2. Consider what is F=ma. The top down understanding of mathematics in general is very lacking.
The precise, integrated, balanced, consistent, and extensive definition of what is TIME is as follows:
TIME is necessarily possible/potential AND actual ON/IN BALANCE !!!! Consider TIME AND time dilation ON BALANCE. CLEARLY, gravity AND ELECTROMAGNETISM/energy are linked AND BALANCED opposites (ON BALANCE); as the stars and planets are POINTS in the night sky ON BALANCE. Accordingly, on balance, the rotation of WHAT IS THE MOON matches the revolution. Gravity is an interaction that cannot be shielded (or blocked) ON BALANCE. WHAT IS E=MC2 is taken directly from F=ma, AS c squared CLEARLY represents a dimension of SPACE ON BALANCE; AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY (AND NECESSARILY) proven to be gravity (ON/IN BALANCE).
NOW, consider what is the balanced MIDDLE DISTANCE in/of SPACE. GREAT.
By Frank Martin DiMeglio
No need to apologise, sir. the best thing is you made sure to me that I won't waste another ten minutes of my time to go after another video to understand this theory better. because you taught me it clearly to the point leaving no unanswered questions. Thank you!
Amazing. There are a lot of videos on TH-cam that try to explain the function of LASERs but none are as practical and thorough as yours. Excellent Job. Thanks for the great explanation.
Probably the best laser structure explanation on the web!!!! Thanks a lot
I had no idea how lasers were made and the quantum mechanics behind them .
Thanks for going over 10 minutes n give this great explanation.
👏👏👏👏
You are very welcome! Glad you enjoyed it!
Thanks, well done.
Thank you!
I saw one of the first Bell Labs gas lasers demonstrated when I was a Boy Scout in 1966. It's amazing how this video brought all the physics back to me 56 years later. The light was invisible, but the instructor transmitted music with the beam to a receiver 4 feet away and proved the existence of the laser beam by blocking it with his HEAD. We were sure he'd have a hole in his skull! Thank-you for the video.
I'm sure there is no problem if it's longer than 10 or 20 minutes. thank you very much.
all the best. and Merry Christmas!🤗
Thank you!
Wonderful explanation, thanks a lot!
Welcome!
Absolutely hands down this is the best explaination of how lasers function EVER!!!
Thank you!
Outstanding bit of TH-cam.
Well described and easy to understand for the non particle physicist
I just watched the Nobel price winner, Donna Strickland explaining lasers to 5 levels students and could not understand what a laser was. Now, with your explanation I finally get it. Took me 53 years to understand how lasers are built.
Top top lecture appreciate your enthusiasm
Excellent and very informative. It is almost "criminal" when you are interrupted by an advertisement.
Thank you so much for covering this sir! Best educator ever. 👍👍👍
You have a gift, sir. Very few people can explain complicated systems this clearly and directly. Thank you for putting it all together!
You're honestly my favorite TH-camr, and one of my favorite humans as well. Wish there were more genuine teachers like you in the world! I'll be subscribing to your full content soon.
Wow I really appreciate that!
Excellent explanation, plus, at 15:52, you talked about that unforgettable character from one of my favourite movies "The Fifth Element".
Corbin Dallas!!!
This is interesting. I hope someday you'll do lessons about quantum physics
Me too! Thanks so much.
Hi, I was thinking about paying for your online membership courses but I have a couple questions. 1. I had a browse through your website and I notice a section where you buy extra things. My question is if I pay for the course do I get access to everything or would I have to buy extra things? 2. What lever do you teach up to, high school, college or university?
@@gloriakalengelayi8294 best bet is the streaming membership. With that you get access to everything and can cancel anytime. Alternatively you could purchase courses but it would only be for the course you purchase. Most people get the membership. Thank you!
@@MathAndScience thanks for the reply. I am right in saying the $399 membership is part of the streaming membership? What levels do all your courses go up to hight school, college or university?
@@gloriakalengelayi8294 yes that is ab3 year streaming membership and you can watch everything. Definitely up through university. I encourage you to poke around the site and read reviews. I think you’ll like it!
It's ok. Don't need to apologize. Take 30 mins because I have still not fully understood. Exceedingly Excellent explaination .
You are a great teacher. I have a PhD in EE and still learn from your posts. ❤
what do you mean "forgive me" XD it was beautiful, thank you !
Thanks so much.
Very well explained. Great presentation. Thank you.
Nice 👍
You are wonderful. I could listen and learn for even longer time. But, of course I'm 73yrs old so I've learned patients as well, lol.
This is not an easy topic to chew it needs time.i congratulate your fast and easy ways of teaching.
Thank you! 😃
Another gold star video! You explain things in such a way that it makes sense. Why didn't you teach at my old high school or college. Thank you for taking the time to put these videos out!!
Really appreciate it!
Maybe you were not studying engineering?
I love these 10 min science videos, perfect scope and conveying just enough detail. I had the video slowed down at 21:27 and noticed a quiet automated "I didn't get that" sound lol. I did.
Best teacher on the net.
Just wanted to say thank you, i was able to pass my commercial industrial wiring class, thanks to the help of your AC Circuit Analysis Tutor - Vol 1. Best Money i have ever spent for Help. thank you Jason.
Awesome news and thanks so much!
How best! You are the best tutor I'll cling to in the entire interenet, you have boosted my love for physics and math
This makes me happy!
You make a dry subject so animated and absorbing! Thank you. Freddy
I can't stop absorbing this science lesson!
So happy to hear this!
Thank you Sir for this simplified explanation
Great description
Your forgiven..This explanation ..BEST Ive ever seen ..You've got the gift, and your using it wonerfully.
Thank you!
Amazing lesson, really enjoyed learning. Many thanks.
Excellent presentation!
The best explanation on lazer I ever heard!
Are you kidding me, forget about the length, it was great! Entertaining and informative .
Glad you enjoyed it!
Thank you for this course on the laser and its basic notions, it is very interesting for many students to know more about the laser and how it works?
Studying through without continuity. Thank you for shedding the light 😊
Totally worth the extra time
Great explanation!
Excellent class, thank you very much.
I want you to know your appreciated as a creator of extremely valuable content. I try so hard to explain ...well this to new electronic techs and simply cannot. I know it but all I can do is absorb info not teach it. But electricity does this, it "flows" (but not really of course) to the lowest (ground) state... So anyone hanging around ⚡ high voltages, well, don't be the ground state. 😬
Side note: Also those 650nm natty light wavelengths can give you a painful tan and higher wavelengths can cook your Christmas 🎄 goose! Happy Holidays buddy! 😇
Happy Holidays to buoy too. Thank you for the very nice comment!
My sincere thanks for a wonderful wonderful explanation! No apology required. Well explained!
Thank you!
You are a genius teacher. I wish i had you as my teacher in my high school and University.
Thank you so much!
fantastic explanation
Great lecture
Another great lesson. Thank you very much )
Really appreciate it!
This is an awesome tutorial. Thank you for sharing.
Awesome video, Thanks!
very good explanation , thank you
Welcome and thank you!
I'm from India
Very informative and your way of explaining is wonderful with high enthusiasm.
Yuore the best kinda person man. I LOVE THESE LESSONS! Thanks
Well explained
Another excellent job! Please keep up the great instruction!
Thank you!
Finally understood this, thanks so much :)
this is mind blowing ....can't believe what i heard was made so simple ....this is ultimate experience ....great work and social service ....tons of thanks to you ...
Thank you so much 😀
This was great. Thank you.
Great video.
“10-Minute Science” in 22 minutes perfectly exemplifies the current state of “Science”. The unaccounted for 12 minutes represents the inconvenient facts that are ignored but fundamentally undermine the core tenets.
Excellent explanation, thank you!
You are very welcome.
Outstanding
Fantastic explainatiob
How people of the past were able to understand this stuff without the technology we have now is mind blowing to me. Excellent video!
Thanks!
Best Science Teacher Ever
Thank you so much!
Thank you. I learned something today.
Thank you for this information.
Another great one, Jason! Thanks!💓
Thank you!
This is the best description of lasers that I have ever seen. Thank you.
Welcome!
Thank you very much for this detailed video.
Welcome!
I loved it great explanation
Very Interesting.
Very informative and educational, thanks.
Glad you enjoyed it!
10x sir. Ihave been wandering this.
Thank you!
Excellent
This is awesome!! Thank you! I am a sales person and this bit of information is well needed to help educate end users. 👏🤗❤️
Many thanks
Perfect explanation.👍
Glad it was helpful!
I took a coarse in lasers in college.
Wish You were the teacher
✌️
Physics bless you sir. That's amazing. Thank you
I'm a little fuzzy about how the flash tube works and how light from it is achieved and controlled. I do not mind you taking longer to explain the quantum nature of this device. These things are a lot easier to visualize considering your explanation. I love it.
Loved it
amazing video and information. these videos are awesome.
Thank you!
THANK YOU... SIR...!!!
HAPPY HOLIDAYS AND
A HAPPY, HEALTHY AND PROSPEROUS NEW YEAR... WITH LOT OF WISDOM TO HELP THE HUMANITY TO HAVE QUALITY LIFE & LIVING...!!!
YOU ARE A GOOD & CARING TEACHER...!!!
THANKS AGAIN...!!!
You are tops... as my tutor... all clear..to me.
Excellent lesson thank you very much 👍
Welcome!
This was excellent!
Thanks so much.
Merry Christmas.
I finally understand how they work. Thanks
Very good.
Thank you. It's very educational.
Welcome!
As a mechanical engineer, I always wonder: How do I make the device which uses this concept? All of the theory in the world doesn't help unless we can put it into practice. In this case, we definitely can!
Hearing things like "This is how we pick how long our ruby rod will be" makes me so happy! I could probably make a solid state laser with this knowledge!
I have seen solid state and gas lasers before. You explain a solid state ruby laser pretty well.
The CO2 lasers I have seen put high voltage through a glass tube of CO2 gas. This produces a vaguely purple glow. Mirrors at either end then reflect this light back and forth, and a beam leaves one end, which can later be focused and reflected through a system of mirrors to cut or engrave things with a laser. How neat! Also, the wavelength of CO2 is below where the human eye can see, so this laser is not visible light, but still very useful.
Thank you so much for the video !
My pleasure!
A beautifully done ''10-min'' explanation of a LASER!
(If I may add a minor point about the last drawing: instead of the single wavelength/ oscillation drawn between the two ends of the rod, if many little wavelengths/oscillations were drawn that would have perfectly illustrated the corresponding verbal comment.)
Thanks for the video.
Mint on so many levels, thank you 👌
Thanks so much.