How Lasers Work

[RamdomCoolStuff]

awesome video dude thanks a LOT!

[indiage]

I Love The Video It Can Increase My Knowledge A simplified discussion on how lasers work

[kelekokerupuk]

Good, I like that you share this video, I wish success always A simplified discussion on how lasers work

[yousafanwar]

you explained a critical thing very easily

[ravian863]

really aw some...very informative thnx dear for uploading such a nice stuff

[hallomee]

Thank you for posting this, i was just going to tell the same story (Y)

[neohashi]

The part about stimulated emission is wrong as it implies that the emitted radiation is released in random direction.

One atom spontaneously emits a photon in a random direction, true.. this photon then collide with another _excited_ atom that immediately emits a photon of the same phase, energy (color) and _direction_ as the incoming photon. This is stimulated emission.

As the photons bounce between the mirrors the majority of the photons get the same direction and phase.

[soumyasayujya]

it would hav been better if audio was dere......nice and informative and easily explained nevertheless.......... thanku!!!

[shoppittsburghnow]

really informative and interesting

[willk113]

you dislikers are retarted. this was very helpful to me. (science project)

[bachkwt]

you're A BOSS

[legendfan003]

I was playing with my laser pointer today, and wondered how it worked. This is a great video. I will recommend this to someone who is wondering.

[jimbo5770]

NICE!!!

[jitjpie]

9 idiots in the youtube community who didn't like this

[eMundayGaming]

fuck off those who didnt like this

[Andra0417]

very helpfull thx!!!

[talontooner]

Now make a video on how to charge the electrons :)

[limsweesien]

@talontooner he did.. by injecting energy. via optical (flash lamps or another pump laser) or electrical (more common for semiconductor laser diodes)

[riyadcuet1]

very nice video, thanx for share.........

[PeculiarTactics]

Great video thanks for making it!

[quadcoreQ]

cheers for the concise explanation!!!!!!!!!!!!!!!

[MrSkinnyBill]

Very useful!

I think its amazing that you can arrange mirrors so that you get a straight beam of light without some of the beams speeding out and across (IE. how you get parallel lines of light, and not those that will close in together then spread back out)

[MJFAN666]

What?

[standbackstudio]

very helpful thanks

[stemavr]

RESPECT!



[34jaxx]

Thank you for making that simple!

[shreyans94]

mistake , we dont use laser in optical mouse  but in laser mouse

[lancerb]

@shreyans94 Then explain to me what an optical mouse is.

[shreyans94]

@lancerb there is led in optical mouse and there is laser in laser mouse

[Msfaizan1986]

wow ausum sir i realy like the way that how u explain laser phenomina.thanks sir continue ur efforts in the same way and help us as u did now.again thanks sir

[Salires11]

Btw don't pay attention to the grammatical errors...

[Salires11]

I'm not sure but i think you got 1 thing wrong... @2:10 you say the excited elektrons release energy and you call this stimulated emission.

Stimulated emission is when a photon encounters an excited elektron and it makes this elektron fall into a lower level, releasing energy wich we call a photon. But this photon will have the same direction, wavelength and energy then the first photon....

What you are reffering to is Spontaneous emission or vacuum-stimulated emission

[Salires11]

@Salires11

These random photons will have a frequency which is given by the lineshape function and therefore a given wavelength. So now we have photons of different wavelenghts and in different directions. We place a mirror on both sides and the distance of these mirrors will determine the frequency. Only photons with a given frequency(lets say ''a'') will be reflected. These photons will now interact with elektrons in excited states. Making new photons with the same direction and wavelenght

[gohar162]

thnx.... it was very good i understand it :)

[Rxk3r]

Wow, i just tried to fix my speakers for like 2 minutes before I realized there was no sound !

[JSprayaEntertainment]

how small can we make um ?

[in0sanity]

awesome video explains everything very well

[mu6luvr]

i agree with you

[istephan007]

great vid helped me ALOT on an assignment

[oriondimension]

God save Youtube! God save the Internet that saves you hours of studying in just minutes!

[2BellProductions]

Cool beans, great video. What elements or compounds are the electrons obtained from?

[kumbah2006]

What would make this even MORE "accessible" is someone "reading" the text

aloud to the viewer as the presentation continues on. Still a great video, but

would be even better with narration. Just my 2 cents. :)

[jcgrieshop]

Thank you, good information in a digestable form. Much appreciated.

[lucaug10]

great explanation! easy to understand!

[HstfSengir]

Actually nothing new to me, but... It'll help some other people understand.

[sh9ui17b]

thanks alot..easy to understand it from your explaination..

[thatkid8520]

i guess youtube isnt just retards great video

[knutterjegl]

Much better explained than what our biophysics professor told us, strongly recommended!

[MetalHead61689]

@knutterjegl lol i see it as lasers for dummies, thank god for this video

[shivakumar0419]

ooooofffffff. Its so easy to understand n i got atleast knowledge by wacthing this video. So, thank youuuu so muchhh......

[bray610]

you made it simple and fun, all i could ask for

[DanFrederiksen]

"when the electrons start releasing energy something weird happens"

sooo... you really didn't explain it at all

[quarkphotonect]

He does explain very well actually

[DanFrederiksen]

I don't mean to be discouraging but it doesn't satisfy me that the critical issue of stimulated emission is explained as an infectious mood. lasing is basically stimulated emission and nothing more so if you don't explain stimulated emission then I don't think lasing is explained.

[quarkphotonect]

Ok You have a point.

[DanFrederiksen]

but in fairness it can be an ok introduction to the mystery that is the laser.

even Feynman was once asked to explain lasing and he fucked it up royally and didn't even realize it

[quarkphotonect]

you Seem To be Pretty Clued up.

Are you a Laser Enthusiast?

[DanFrederiksen]

nah just slowly trying to absorb physics and maybe take physics further one day. I'm not impressed with the last 80 years of physics

[quarkphotonect]

That's fair enough

[hilowns]

good

[deathfirez]

Wow.. i udnerstand now.. i have asked so many in my family about lasers.. i never get a good answear.. And everyone ive asked have been teachers in maths and stuffs... i finally got a nice answer!

[HiddeHeitbrink]

@deathfirez perhaps ask your physics teacher, more chance that (s)he knows more about it, still, i allways thought it was just light, all beamed into the same direction using lenses :P

[jimmyshitbags]

@HiddeHeitbrink whats physically interesting about lasers is not that the light is focussed, it's the way it amplifies its strength in successive passes through the gain medium.

[sahoobi]

thanks..very helpful!

[wolejohnson007]

Just wanted to let you know that your video saved my butt. You should be a teacher, if you are not already one. Thanks!!!

[calexculux]

love ur defination

[weapon231]

Good video and illustrations.

[mattthemad123]

my green laser goes red wen it is cold

[3dot141]

whats with the picture @ the end?

[mattthemad123]

lol yer

[ladiesman7777777]

I DONT GET ITTTTTTTTTTTTTTTTTTTT OOH78 OK thx bi

[joeylawn36111]

....and don't forget Shoop Da Whoop.... :O>>>

[ChaosxLord]

it burns by providing high levels of energy at in a small area i think

also, thanks that was really helpful - better explained then all my physics books xD

[DrummerInTheHead]

the burning ones have a higher transmission percentage, that is to say that in a normal laser, only 1% of photons are allowed to come out of the laser for example. but industrial lasers allow more photons to come out

[46747]

Thank you! Science assignment is easy now.

[Pleffa0101]

Good video!

[saleall]

so how doese it burns??

[cgirona]

Interesting!