The 2018 Physics Nobel Prize, Part 2: What IS Laser Chirped Pulse Amplification?

[@matthewbrennan3127]

This channel needs to be bigger. This is a really high quality educational video

[@Trotskisty]

It takes time for any channel to reach 'critical mass'. So success for a good 'product' entails just doggedly sticking at it...

[@NoobMaster-or2jf]

You explained in 13 minutes what I took 1 week to understand. Please make more videos!

[@ibknl1986]

Excellent explanation. Your channel definitely deserves more views. All the best

[@ZarawarGill-cm6fy]

This is one of the best explanation videos I have ever seen I honestly don’t understand how you can have such little views I honestly hope you become a bigger channel

[@omsingharjit]

3:49 but for Fusion confinement time is also required and this puls is extremely short so why it will help for Fusion?

[@audreyzeng4459]

love this channel and love your humor. i've been on laser youtube for the past two weeks and your channel is my favorite so far

[@rumbepack]

this video it's incredibly convoluted, and only fulfils the promise in the title in the last 4rd of the video.

[@mateolaguna6542]

This is an amazing video!!! Easy to understand, thank you.

[@daguaishouxd]

You totally deserve more follows. The videos are gold!

[@atomsandsporks6760]

Thanks!

[@rhiannonlarsen5805]

Such an excellent simplistic overview explanation of CPA! This should be the precursor to reading any journal articles on the topic! I know I will be using this to explain CPA to students and colleagues in the future! Thanks and well done 👍

[@petevenuti7355]

Yes , please talk about how they did it, please explain Q, and all those other things you didn't think we would be interested in.... Do you think I could use a nitrogen laser to pump a hydrogen plasma to do something similar? At what power level does air become a nonlinear medium?

[@davefoc]

Do Ursula Keller's discoveries/inventions fit into this somewhere? Keller is credited with the development of SESAMs.

[@debrachambers1304]

Naming a LASER Icarus is asking for something to go wrong

[@InfiniteUniverse88]

The Higgs Boson particle was detected in 2012. The LHC technical design was approved in 1995. How much have lasers improved since then? What is the smallest possible particle accelerator, using current technology, which can detect the Higgs Boson?

[@doncarlos8836]

how do they measure this short pulse? these speeds are beyond electronics.

[@olternaut]

This stuff is fascinating! I want to learn more about USPL technology.

[@TheIrishYoshi]

Great video, fantastic info and really high quality. Basically helped me write most of my assignment, so thank you

[@Andratos95]

Btw, 1:55 is incorrect... 1 watt means literally 1 joule PER SECOND. So, to say that you have 1 watt in a femtosecond makes no sense (at least not in the way you want). You should instead say that "1 Joule in a femtosecond is..."

[@atomsandsporks6760]

The video is correct and it is in some sense the entire point of the video. If we assume that energy is conserved in the CPA beam shortening process then, since energy is power x time, compressing a, say, 1 second pulse to a femtosecond pulse increases the pulse peak power of that pulse by 15 order of magnitude. That's why you do it in the first place, to obtain extremely high optical powers... if only for the briefest fraction of a second.

[@Andratos95]

@@atomsandsporks6760 But it's the compression of an ENERGY of 1 Joule into a femtosecond which increases the power from 1 Watt (which is 1 J/s) to 10^15 Watts (or 1J/fs), I think... A Watt is a derived unit, defined as 1 Joule/1 second. Therefore I don't think it makes sense to talk about watts/s, as this would be J/s² which I don't know if it has any valuable physical signficance.

[@aantoine5819]

These are some good videos , I wouldn't mind seeing a vicpdeo on how the compressor works

[@InfiniteUniverse88]

Powerful enough lasers can make the cold war obsolete. If stealth planes can be detected, and hypersonic missiles can be shot down, then the world will be a much more peaceful place. The only way to have world peace is to put an end to the arms race, to have one uncontested superpower.

[@aantoine5819]

@@InfiniteUniverse88 what?

[@InfiniteUniverse88]

@@aantoine5819 That was my way of agreeing that they're good videos.

[@georgewbushcenterforintell147]

U could use this on a solar light sail instead of a cw laser

[@PhantomKING113]

10/10, love it, continue like this!

[@atomsandsporks6760]

Thanks!

[@marthareddy9554]

Fantastically made simple

[@deadeye_john]

Is the amount of photons in a pulse stay the same during chirping?

[@atomsandsporks6760]

Some day I plan on doing a video about how the concept of photons is used and abused and often not worth the effort as a mental picture. It is almost always a far better mental picture to abolish the word "photon" entirely and instead say "quanta of an electromagnetic (EM) wave/field". They ultimately mean the same thing, but your intuition is going to be correct far more often if you go into things with the latter idea. So you have some travelling EM pulse that gets stretched out along the axis in which is travelling forward. However, if you add up all the energy in the wave, added up over the full pulse, that must either be the same or less than before, after chirping. "Less than" because there could be absorption of light during the process. If you want to talk about "quantas of the EM field" (i.e. "photons") then at any point you can imagine breaking that wave up into its component sine waves. You can do this with any wave, break it up like this, it's called "Fourier decomposition". Then when you've got the full field as just a sum of a bunch of different sine waves a "photon" is the recognition that the intensity or amplitude of each of those sine wave can only change in clumps. Each can only ratcheted up or down in strength by discrete amounts. The number of quanta at a given moment depends on the wave's shape and the total intensity of each of these sine waves that are needed to add up to make it and changes completely from moment to moment if the shape of the pulse changes. Energy must be conserved (assuming no absorption) but there is no notion of "conservation of photons" in physics.

[@deadeye_john]

@@atomsandsporks6760 Sorry I meant to say, "Does every photon in the regular laser pulse get chairped? Like turn 10 photons into 10 gamma ray photons?".

[@tablab165]

Very cool science! The only part I'm opposed to is nuking Yeller. So many people seem to have it out for the old boy.

[@rationalist7]

Still tough for me to comprehend what you are explaining

[@demoncloud6147]

You can do 'Tight Beam' communication in space too

[@RedBCPride82]

What if that laser pulsed one time in your eye? Would our brain even register what happened while the eye gets damaged?

[@John-ht4xv]

Great video!

[@KTHKUHNKK]

Super cool and powerful stuff.

[@Gief18PlusVids]

Your videos are great.

[@Andratos95]

Wait... You're the guy from 3Blue1Brown?

[@edwardgrigoryan3982]

Stupendously well done!!

[@Mr0rris0]

Whole thing is the brain child of acoustic levitation/Egypt territory and underwater night vision. Cool stuff Make lightning throw a ping pong ball on a wave like kamikaze silver surfer

[@lambda4931]

I thought the chirp was the result of a beat frequency .

[@eigendyaksson4909]

Неправда, первыми изобрели лазер Басов и Прохоров) Мэйман лишь довел его до того вида, который мы видим сегодня, он даже не получил Нобелевскую премию

[@sto2779]

1:45 - WTF.............

[@sukaisnaini1843]

amazing

[@sadface7457]

If you had a powerful enough lazer you could create an accelerator just from the photo electric effect.

[@atomsandsporks6760]

I mean, the FIRST particle accelerator were cathode ray tubes (CRTs, like those used in old televisions) where electrons are accelerated by the electric field between two plates. Electrons are ejected from one plate (really a coil) by thermal emission (i.e. it was a hot wire) but one could also just as easily use photoelectric emission.

[@sadface7457]

@@atomsandsporks6760 It is remarkable that you can concentrate the power of lazer due to its negative temperature. en.m.wikipedia.org/wiki/Negative_temperature#Lasers

[@atomsandsporks6760]

@@sadface7457 Well actually if you DIDN'T have negative temperature in the electron system then you wouldn't be lasing at all! Population inversion is a key part of the whole lasing process.

[@smokey04200420]

Laser guns!

[@InfiniteUniverse88]

Raytheon, Lockheed Martin, Honeywell, Northrop Grumman, and Boeing are working on that. #AmericaFirst

[@undernetjack]

This 'chirp' high energy pulse sounds like the are making laser guns. LaZER GuNZ.

[@Helica123]

haha its funny to hear about optics in such a different view (as an optics major)

[@remomaurya7293]

Good

[@zoozolplexOne]

cool !!!

[@brandonwhittle6762]

you didnt mention grating doesnt bosst the peak this is misleading

[@kricketflyd111]

They should have called it... a pinch laser

[@atomsandsporks6760]

But now we have the fun of guessing whether someone is talking about an accountant or an ultra-high-powered laser. It's the little things in life.

[@bhagyeshshiyani2490]

honestly, very confusing explaination. making the explaination more complex by chewing the things. explaination is way different than the Video "TITLE"

[@ThomasLee123]

There is no such word in English as “nu-ku-lar”. How do we trust your science if you don’t know the words you use?

[@JoseFerreira-lq6md]

Amazing video!