AT&T Archives: Principles of the Optical Maser 

Back to first principles.

Lasers are not masers. Although masers and lasers work on the same principles (population inversion, coherence, and collimation), they have different applications. Both are still used, but you won't find a laser that does a maser's job just as you wouldn't find a maser doing laser work.

But how amazing would it be if at the end this dude just said - please don't forget to smash that like button....

@@thapthoptheep2076 ha ha - yes maybe.

“And check out our merchandise! We have T-shirts that say ‘My MASER can beat up your vacuum tube.’”

Plot twist: He was an android.

Yes - he finally made me understand the principle properly.

QUITE!

I concur

Rather

I think it's called "BBC English".

@@arnoldrimmer8008 Modified for AT&T use.

Whom were you addressing?

All too often gay men in STEM fields stay in the closet, long after they took castration or prison off the books for the "crime of homosexuality". The secrecy becomes a part of you after decades of hiding. I've seen many obituaries for late engineers that casually mention "his husband" somewhere in the paragraphs.

@@NimbleJack3 Or maybe people dont obsess over this like you may think. No one gives a shit about a persons sexual orientation just like no one gives a shit that Dr. Salk the inventor of the polio vaccine was Jewish. People only cared that he made the vaccine. So I'll repeat again, NO ONE GIVES A SHIT ABOUT A PERSONS SEXUAL ORIENTATION!!

And if you knew that what difference would it have made?

You sound "triggered", friend. Do you need a safe space from discussions about sexual orientation?

@@ThunderAppeal Sir, you are so wrong. I recently had a conversation with an otherwise respectable lawyer who to me that he is very homophobic and not ashamed of it. He told me he despises all gays, including family members. The other guy in our conversation didn't say anything but he was nodding his head in agreement with my homophobic friend. I told a female coworker about the conversation and she told me that also hates gays (she used a derogatory slur). She said they are sick and disgusting. Society has come a long way but we're not there yet. I know it's a different subject but as a black man I remember a white guy told me that no one cares about skin color anymore. That's not true either.

If he was, you wouldn't get away with 'Yo' :-)

Yet the phrase 'infrared laser' is commonly used.

physics. I think you learn a little bit of physics in chemistry. But I think it's mainly quantum physics or electrodynamics. idk but I think maybe classical electrodynamics or classical electromagnetism would help more. But I think that what is happening here is based on a quantum effect. He talks about Hertzian dipoles at (6:29) I didn't know what that was so I looked it up and the link I clicked on told me to think about to spherical conductors, connected by a wire, with a net zero charge and where the length of the wire was so small compared to a wavelength of emitted radiation. I read that and I thought "Nothing can get that close" and then I remembered the two charged particles the electron and the nucleus are very close together and when an electron loses energy and drops down from a higher orbit it emits a photon. I'm teaching this stuff to myself though so I don't know if that helped, but I don't think chemistry will be very helpful. I could be wrong though. I got this Physical Chemistry and it talks about stuff like nuclear magnetic resonance...

What Dr. Garrett actually says is that light and RADIO WAVES are of the same nature. They are both electromagnetic radiation, just at different frequencies and neither of them requires a medium (such as air) to travel through a distance. As you noted Maya, sound is an oscillating pressure wave and it requires a medium to travel through as there has to be "something" to transmit the pressure. That medium may be air but it could also be some other substance. For example, sound travels very well through water at a speed much higher than its speed in air. Speed of sound in air is about 343 metres per second and in water about 1480 metres per second. In mild steel it is about 5960 metres per second. These speeds are all very slow compared to the speed of electromagnetic waves which is about 300,000,000 metres per second in air or a vacuum. In solid transparent mediums such as glass light will travel slower which gives rise to the phenomenon called refraction where the direction of the travel of light is bent. The amount of bend depends on the frequency of the light and this is how a prism is able to separate the different colours (frequencies) of light. Dr. Garrett is using some analogies with sound to try to explain certain aspects of the maser (in particular stimulated emission) but he does warn that because sound and electromagnetic radiation are very different things you cannot carry the analogy too far or it will cease to be accurate and cause confusion. I hope this helps your understanding...

Yes, the jazz didn't match the timbre of the presentation. I'll take the jazz.

Nokia owns at least one of his early patents patents.google.com/patent/US3215949

In early October, 1962, Dr. Garrett spoke at an Engineers Symposium in North Carolina. The topic was his book, "Optical Maser".

He was known among his colleagues as Geoffrey.

Oh that made me laugh ! good one !

quantum dots?

Dielectric Planck fractals.

25:10 I, too, lack the pumping intensity to make Ruby oscillate :(

An 0ptical major is the 0utcom of a bulb

You're no fun anymore.

@@cipndale I'm still fun 2 yrs later. HI!

Very cold and businesslike, to be sure. That was considered "proper" back then. Being human was a weakness to be exploited by lazy students.