How a Laser Works

Do not aim a Lazer pointer at a satellite dish. You get a sort of a shock. What ever is happening at that moment can not be good for you.

I love watching your videos on a boring trip

So with other words, lasers works by concentrated light?

I have been really enjoying your videos. Thanks for making them!! It would be cool if you had some 'dumbed down' versions for fellas like me :).

Very eloquent video as I have never seen anything like it about 'Light Amplification by Stimulated Emission of Radiation' in history. I'd wager that "engineerguy" possesses at least 150 in the IQ dept... Studied solid state diode lasers solely and it seems they are nothing more than a focal beam of monochromatic light focused by a lens.. Bla bla. Awesome video.

sir, can u explain waveguide of optical fiber modes by any video...

I would like to understand the polaroid filters at atomic level. Could you help me on that?

this particular video is too smart for me :s

wow!

I would like to offer an observation I recently noticed regarding vision, macular degeneration and blue light. I realized I did not hardly notice the blue light from an LED until I saw it peripherally. It was very bright; a normal person would not understand that I am not seeing the blue nearly whatsoever. I can see the green LEDs with only slightly less intensity. I am mentioning this here because of the unexpected tangent brought up, and I am believing this may be a contribution of some sort.

thanx mate very interesting people like yourself make the interweb worth bothering with

I thought the laser was one death ray.. but the video is still good at explaining one concrete basic object

kanker leuk

What is strange is the length of the rod mentioned, and the fact that the standing wave is formed, is the SAME PRINCIPLE at play in a truck air horn, or a musical horn. In the laser here, the light builds up, forms the standing wave, and as it achieves this, it begins to escape the one end. In a horn a vibration starts on the diaphragm, or reed, or your lips, or whatever. Until the standing wave forms, the cylinder (forget the bell on the end which amplifies the volume of the sound, by allowing the wave to grow in amplitude- or amplitude modulation, if you will) is "seen" as a closed end cylinder, (if that makes sense) and once a standing wave completely forms, and all the peaks and troughs are "marching" in perfect alignment, the sound emits beyond the end of the tube as a cohesive single frequency sound.   This was hard for me to try to put into an understandable paragraph, and I hope I got it right! In the laser, the tube of ruby material is effectively closed to a degree even with the partial mirroring, until the light gets to "marching in step". If you cut the bell end off at the right point, you would still hear the sound, it wouldn't be very loud, though. There must be some design in the shape of the bell, because it allows the exiting sound "wave" to grow in height, or amplitude, without changing the frequency, or the distance on a sine wave from the 0-point to the highest pressure, back down through the 0-line to the lowest pressure, and back to the 0-line. Did that make sense?  I tried anyway!!!

shameful entertaining!

I lost it when he started talkin bout how it works

Feels like I'm watching Nova... or Modern Marvels. Super high production value, great job!

Hes a scientist haircuts dont matter lol

It really is a sad thing to see the shitty comments some of you ungrateful people post..