Hi, thanks for the video. But how about if I use different dt=L/c (just let photon bounce 1x)? Then dN=-N_0(1-R) and I obtain a differential equation with different coefficients. Or if I take 2 roundtrips, then dt=4L/c and dN=-N_0(1-R^4) which is again different, assuming both reflectivities are the same. So this 1 roundtrip is somewhat a special occasion when this works?
In this video, you used a round trip of photons to get the delta Np and finally got the lift time of photons. But I use two round trips of photons to get the lift time, my calculation give me a different value from yours. I do know what is wrong with my calculation. Or do you know other method s to build this differential equation ? Thanks for your help! :)
Essentially, yes you can think of it that way, since the leakage rate and the #photons still in the cavity have essentially the same mathematical form.
Thank you very much, very clear
Thanks a lot. I love your videos, and it's a clear speaking about laser.
How does this lifetime of the photon relate to the Finesse of a resonator?
Hi, thanks for the video. But how about if I use different dt=L/c (just let photon bounce 1x)? Then dN=-N_0(1-R) and I obtain a differential equation with different coefficients. Or if I take 2 roundtrips, then dt=4L/c and dN=-N_0(1-R^4) which is again different, assuming both reflectivities are the same. So this 1 roundtrip is somewhat a special occasion when this works?
In this video, you used a round trip of photons to get the delta Np and finally got the lift time of photons. But I use two round trips of photons to get the lift time, my calculation give me a different value from yours. I do know what is wrong with my calculation. Or do you know other method s to build this differential equation ? Thanks for your help! :)
“Round trip” just means there and back. So from one mirror to the other and back again. This should traverse two lengths of the cavity.
Should not there be another distributed loss due to scattering and absorption due to impurities.
Absolutely, but you can lump it into an “effective mirror loss” afterwards. Just easier to ignore it at first.
SO, basically, this is giving me the average life time of a photon in the cavity?
Essentially, yes you can think of it that way, since the leakage rate and the #photons still in the cavity have essentially the same mathematical form.
@@JordanEdmundsEECS Thank you!