The Little Vertical Laser That Everyone Uses

oh yay a video about semiconductor lasers to watch while i sit at my job manufacturing semiconductor lasers

Here so early light is still horizontal

what's amazing is - there were no lasers until the 1960's. even in the 1980's lasers were a laboratory item. (i know this first hand). its amazing how you can now buy a lethal power level laser on alibaba now. should i have seen that coming? or did i not watch enough old school sci fi movies from the 60's?

Yes finally night vision nerds can understand the difference between edge emitting lasers and vertical emitting lasers

Wow, never thought I would get to be the one to say something like this, but seems I got early enough, there's a small imprecision, multimode laser signals are not necessarily laser signals of different color, it's the difference between how the light is stably reflected in the optical cavity and then in the optical fiber that is the difference, think of it as the angle of deviation the light travels through the medium, in a perfect world the angle would be 0 and the laser would go always parallel to the gain medium or the optic fiber, in reality there's always some deviation, in a single mode laser the cavity of the system reinforces by constructive interference only light waves that are very very close to being parallel to the gain medium, giving a more coherent and punctual laser beam, while in the multimode systems the system allows for more possible angles in the light waves that reinforces or 'modes' of the laser beam, thus producing a less punctual, more dispersed beam, but beeing much easier to build, and in the case of optic fibers that transmit multimode signals, it results in much more bandwidth, although with more signal distortion after long distances compared to optic fibers that transmit single mode lasers. I'm just an accidental enthusiast of telecom technology, so I might have some details off, and I'm aware that it doesn't alter the bulk of the video, but If not in asianometry, where would I talk about this? Anyway, thank you for coming to my Ted talk, and if you are asianometry, remember you are awesome 🤝 best regards from Mexico

anyone else lasing their little vertical to this

Missed opportunity to show how awesome ToF distance sensors really are.

Future video idea: PCSELs - photonic crystal surface-emitting lasers They're INCREDIBLY high power very tiny semiconductor lasers that tbh I don't really understand... 🤔

here so early the comments haven't cohered yet

I don' know how you do it, Jon. I sit here, simply spellbound by your tales of Industry. Thank you.

As someone who works in the photonics and laser field I love when asianometry gives us some love

1:18 _"At some point, the light gets strong enough to burst through the partially reflective mirror out towards the target."_ That's not how it works. The partially reflective mirror reflects *_most_* of the light which is bouncing back and forth, and the rest passes through it, out towards the target.

Babe! Wake up! Mr Asianometry has released a new video! I like the citations you added at the end of the video.

Holy hell. This is how they’re doing solid state Lidar.

1:42 wafer? The first ruby rod lasers weren't wafer packaged. Also, Ruby Rod => MultiPass!

Another video that gets me inspired, so many brilliant people moving our world. I remember my older brother taking me to the Science and technology museum in Ottawa in the seventies to view the laser lab on exhibit. Him trying to explain to his goofy kid brother how laser technology was going to be massively influential. I imagined soon having a pocket laser set to incinerate, not exactly what he was trying to explain to me. Your vids are excellent. I imagine the engineers drank the whiskey after cutting the wafer, either to celebrate success or numb the pain of a failed project.

A Vicel, a Pixel and a Strobe Light walk into a bar...

A laser can have multiple spatial modes as well as frequency modes.

Well I was going to go to sleep but I guess I'm hyperfocusing on every damn word in this video

77 "Kelvin"? 9:47 That doesn't seem too hot to me! Were these all originally cryo chips?