How Lasers Work, with Neil deGrasse Tyson

How do Lasers work? Neil deGrasse Tyson and comedian Chuck Nice break it down for you. You’ll learn about how atoms and photons work together to make a laser work. Also, find out how lasers are used - from beauty to warfare.

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About StarTalk:
Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!

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[SASkinPro]

I think Einstein would have enjoyed lasers being used to entertain cats.

[AccessCode]

"so there was no laser, and then he mathematically said hey check out this laser"

[patordie]

the zoom editing is everything in this video, A+

[wwjnz]

Wait a minute... My retina is 2 to 3 times more sensitive to green light, as opposed to red light? I will have to remember that, the next time I'm in traffic court.

Thanks Neal.

[spectre]

The moments when Chuck gets super excited about science warms my heart. Scientists and science enthusiasts are like kids in candy stores and we love it.

[Jay-Kaizo]

Einstein was an absolute BOSS. I wish we had just a few more decades of his brain.

[yougotta]

never knew "laser" was an acronym 😱 my mind is blown

[amankumar-xjqj]

Why we can't have teachers like him in our school

[mrmakerGD]

4:15-4:19 Neil is so adorable! So pure, so cute😂❤️🔥

[coffyboy]

Neil deGrasse Tyson, you are the bedst for our world.
And I say that, in a small country like Denmark. Love you vidio's, . keep doing it!

[johnl]

I swear...I feel smarter every time I listen to Mr. Tyson. I learn so much. Plus, the banter these two have between them is is so funny

[sagadatnurmagambet]

The reaction we deserved. Chuck Nice is just me watching the video

[gkd]

4:14 Neil's little dance is lit af 🔥

[jjdbzfan]

3:45 when you and your friend finally figure out how to beat a level in a video game

[Malik-psxs]

Bro wtf is einstein. This man done discovered everything

[Hogan]

Oh great. Someone gave Chuck laser vision. There goes the neighborhood.

[troyertje]

0:54 "wow wait a minute are you for real?"



*squeaky voice*

[soulife]

Wait, when he explained it initially he said the [random] atom's electron absorbs the photon causing it to excite (elevate) momentarily, then it calms back down (deescalate), which then causes the electron to re-release the photon. This is 1 photon that gets absorbed momentarily and then released. But then all of a sudden they're showing 2 photons are released for every 1 photon that's absorbed? How does this not break the conservation of energy? And where does the 2nd photon come from? If it's converted energy from the atom, wouldn't the atom degrade over time?

[uyscuti]

You guys rock!! I learn so much, every time!!! Thank you for your knowledge!!!

[darpanpatel]

Chuck realising and getting his mind blown by science is so relatable. I remember my earlier days when I learnt about Lasers and other stuff.