Recent content by dmriser

You actually do not need a local oscillator (second source). If the laser is not single mode, it will beat with itself inside the cavity. The difficulty is detection. If the free spectral range of the cavity (mode spacing) is 5 GHz, you need a detector with response times on the order of...

Ring down spectroscopy uses a similar principle to determine gas concentration to ppm accuracy. A high finesse cavity can have thousands of round trips before extinction.

Clocks traveling fast usually tick slower actually. Some short lived particles can be seen for far longer than the normal lifetime of the particle when they are going fast through a particle accelerator. This can be explained by time dilation. So it is not just clocks but anything that moves...

I suppose I take the orthodox viewpoint.. It seems that Omega0 has a reasoning not unlike Einstein with the hidden variable theory. Roughly, the Bell's inequality give an expected degree of correlation for a system that was derived using the assumption of a hidden variable that already has the...

It will be difficult to mimic the "turbulence" in the atmosphere if you're trying to study spatial distributions. This has a big difference on light that passes through it from a source, take for example a large telescope. It's not just the presence of gas that causes distortion, but the motion...

It is an interesting exercise to open some graphing software like MATLAB and plot a sine wave. Then add another sine wave with slightly different frequency and plot again. Continue to add more waves and observe what happens to the signal. You'll see that the more frequencies you add, the...

I have used mumetal to make 2 enclosures one with a 14cm radius and one about 8. The material seems to be performing well

If we consider the common electromagnet that is made by passing current through a wire coiled around an iron core, I wonder what effect produces more magnetic field: 1. The field produced outside the solenoid due to the current in the wire 2. For this effect I don't insist that the object is...

The index of refraction is a property of the material in question. The structure of the medium as well as the what kind of atoms it's made from are very important parameters that decide how the index of refraction will vary with frequency.

For light waves, dispersion can occur in many ways. Most basically, the refractive index of a material is usually a function of the wavelength of light passing through the medium. This difference in refractive index for different wavelengths leads to a difference in angle of refraction (and...

Homework Statement Calculate the average irradiance for the given laser beam. λ=645nm, P=3mW, d=1mm. Homework Equations S=[E X H] S_avg = (1/2) * c * n * ε0 * E0^2 The Attempt at a Solution I understand the Poynting vector and I can derive the average irradiance formula. I...

I added the line about these schools at the end as curiosity. I am not aiming for a top 10 program. I appreciate all of the advice, and the links provided have given me a lot of information.

I have published once as a secondary author and another is to be submitted. Also secondary.

Thanks for your answer. I agree with you. I just do not know how far down the list I should begin looking.

Hello, I am entering my last year of the undergraduate physics degree program at a small school called Delaware State University. I initially enrolled in University of Delaware and after 3 years I was dismissed for the 3rd time with a 1.9x GPA. After refocusing I transferred to the...