Take it slow, polaritons are a new concept for me. Anyways, I'm trying to get some intuition for excitation polaritons having mass. Is this a quantity that we could directly measure, at least in theory if not practically? How would we separate the mass of the polariton itself from the mass of...
When light travels through a transparent medium and is absorbed then re-emitted, do the phonons just move to a higher energy state after absorption? Is it the same as absorption and re-emission of light by electrons, aside from having a continuous range of available energies?
Short version: how do I figure out how much error I get when measuring light intensity vs wavelength for a given monochromator band pass width?
Long version:
I have a project where we will be passing white light through liquids, then looking at the spectrum intensity of the light with a...
You might consider just using an IC waveform generator like an XR-8038. This'll let you get a triangle, sine, or square wave. They're significantly less expensive than a purpose made function generator. The voltage you get out is limited by what you put in, so if the whole thing is driven with a...
I am using (attempting to at least) a photodiode to count fringes from a Michelson interferometer. Here is the amplification circuit I am using:
Coming out of the op-amp into the comparator I get about 4.2V in a well lit room, 2.17V in total darkness, and 2.33V when the brightest part of the...
I'm interested in predicting the index of refraction of atmospheric air and several nonpolar gases at room temperature for pressures of 1 atm - 0 atm. I'm not really sure where to get started. I have found the relation n=\sqrt{1+\frac{3AP}{RT}} but I don't really get where it comes from. Well...
That's right. If your current source is any sort of modern function generator you shouldn't worry too much about just hooking it up and seeing if it works. Function generators usually have a breaker and other built-in protection that'll keep you from burning them up if you make a mistake, as...
I'm looking at getting a motor to drive a micrometer. It's on an interferometer mirror for the curious. I'll need around 1RPM or so, but I want to be able to vary the speed, because I'm pretty unsure about how fast I'll need it to go for my experiment to work. I'm thinking a range of like 1/4 to...
The cross section was actually given to me, and I just found it, so my problem is solved. I feel like this is something I should be able to figure out though, so if anyone can show how to I'd get to the solution, that'd be cool.
Homework Statement
For a laser, assume single mode operation, only lifetime broadening due to A21 and A1. Write out the rate equations for the atomic densitions N1 and N2 and the flux \Phi.
Then there's a diagram where there's 2 stats. Pump rate is P, stimulated emission between 1 and 2 is...
This. When I tutored freshman level physics, I was surprised at how much stuff I take for granted that people don't have any intuitive feeling for, for instance the idea that position and velocity are relative.
I think my favorite is the amount of empty space inside of solids, and the...
Hold a slinky by the top and let it dangle. Give it a jerk then hold your hand still and you should see the other end oscillate. That's the natural (resonant) frequency for the slinky. If you shake the slinky top up and down at that frequency, the other end oscillates with a large amplitude. If...
If you add another dimension, then its direction has to be orthogonal to the 'original' time axis. Consider time as a bead sliding on a straight wire, then the other time has to be sliding on a wire at a right angle to that. I don't know about implications of it off the top of my head, it's hard...