Prefer to read? Here is my article about lasers: medium.com/@Higgsino/the-surprisingly-simple-physics-of-a-laser-47d7d23e928e Physics Teacher would probably be mad I didn't cover Laser Resonator Modes and the nice property of using 4 level atoms. But nevertheless I hope you learned something new :) - Special thanks to "Pretty Much Physics", "Zap Physics", "Ancient Accounts" and "everything science" for correcting this video. - Thank you to the nice folks over at p5py for making an amazing python animation package. - Thank you to the wonderful patreons
FWIW, you are the first subject matter expert I have found that was able to explain stimulated emission in a way that made it comprehensible! I have watched many videos that purported to explain the phenomenon and all failed to get it across to me. Your script & visuals are just right.
Thank you for an informative video! I don't fully understand why the light coming out of a laser is coherent. "Stimulated emission" explains why an initial photon bouncing back-and-forth can accumulate a large number of coherent photons. But it seems like there would be countless "initial photons" all over the cavity, each accumulating their own, independent collections of photons. Why would the phase of any one group match other groups?
Nice but it seems like everyones explanation is a bit ambiguous around the pot so to speak and very simplistic,i would like to know the math and energy it takes to operate a laser and its output energy and its losses.this information seems very obscure because there is no video about it,not even MIT.what’s up with that?i would love to hear a clear explanation of the mathematical working principles.
is this just a theory or the best sudgestion to date. there seems to be alot of conclusions based on what could be happening. or . the wavelength of light that enters the glass passes through to a space where the ruby crystal has a different effect on light than any other transparent mass. being red. so when the uv tries to get out the other side as a different wavelength. it can't.
you are saying that an electron will absorb a red photon and will emit a red photon? that makes no sense ,from what i know the photon emitted by spontaneous emission will have a longer or weaker wavelength than that of the photon that created it ,this is why for example an 808nm photon will excite yag crystal to emit 1064nm photon, the 1064nm can stimulate other electrons already in the exited state to emit another 1064 photon but if 1064 hits an electron in ground state it will be either absorbed or passed as heat otherwise why not use 1064 diode to excite the yag instead of 808 diode?
Why when the optical cavity gets pumped by the optical pump only half of the atoms get excited? I mean yes, when half of the atoms are excited and optical pump lights up again then the already excited atoms undergo stimulated emission and get de-excited and the relaxed atoms get excited and so again only half of the atoms are excited each time and the cycle continues (this is true only if the atom has two energy levels). But, why only half of the atoms are excited in the first place? Why when the optical cavity is first blasted by light from the optical pump only half of the atoms are excited? Why don't all of them get excited in the first place?
That's a brilliant question. Keep in mind this is just a simulation. But the real world is complicated. I could write many problems, but one big problem is, if you wanted all the atoms excited by one blast the intensity of the photons would be extreme!! And it is not possible to let photons arrive at exactly the same time, photons follow a Gaussian distribution. So if one atom gets excited by the very intensive blast, then a nanosecond after a slight delayed photon would de-excite it. Or the blast could be so powerful it excites other electrons in the atom or ionize the atom
Oh My God! You actually replied! I am your big fan Higgsino Physics! I LOVE all of your videos and your laser video, in my opinion, is the only video on RU-vid that actually explains how it works easily because of the animations. Your animations are phenomenal and they make understanding physics so easy! Your video in which you used dominos to explain sound propagation blew my mind! Your videos have been so helpful to me in Physics. Higgsino Physics, I actually don't have good physics teachers or any people to whom I can ask my physics doubts and so I have to self-study physics and I have an entire document full of doubts in physics. Could you please help me in physics by some means (for e.g. so that I can easily ask you various physics questions if I have doubts in them)? It would mean the world to me if you could help. THANK YOU SO MUCH!
I know this might be a stretch but is there any way through which I can contact you Higgsino Physics for asking nothing other than the doubts I have in physics?
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lm3Bz2Oe7TQ.html The above video is my attempt to explain why is the sky blue in colour. I know it isn't good. I just want to share it with you Higgsino Physics.
pense no tempo como moeda joge para sina agora tentar prever cair 😮 ou coroa 👑 tanto faz o resultado tanto faz tempo os dois estão sertos um tempo no tempo cai 😮 ou 👑