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1d
answered Can AMO physics be applicable for space travel?
1d
answered Why is $np$ always equal to $n_i^2$?
2d
awarded  Necromancer
Apr
16
revised Is light getting another color when travelling through a prism?
added 291 characters in body
Apr
15
answered Is light getting another color when travelling through a prism?
Apr
15
comment Non-semiconductor CW laser types for 445-465nm
Don't know much about rp-photonics.com/upconversion_lasers.html . But apparently they come in blue. Usually longer wavelength than your range, but sometimes in range, e.g. ncbi.nlm.nih.gov/pubmed/19855716
Apr
8
awarded  Revival
Mar
26
answered Do clocks really measure time?
Mar
24
answered Why not just pump directly to the $3^\mathrm{rd}$ level directly in a $4$-level laser system?
Mar
18
comment Obtaining a Positive Hall Coefficient for Electrons Near the Top of a Valence Band
Related: physics.stackexchange.com/questions/10800/…
Mar
15
answered Focus correcting screen
Mar
15
comment What is an absolute frequency reference (Frequency combs)?
I was referring to calibration for the purpose of timekeeping. Then there's no need to adjust the frequency. The only thing you need to do is measure its absolute frequency and write it down. If it's a clock with output in seconds, it probably has control software where you can say what the exact oscillator frequency is.
Mar
14
answered What is an absolute frequency reference (Frequency combs)?
Feb
10
comment Is Planck’s proof of Kirchhoff’s Law of Thermal Emission false; and if it is not false why is it not false?
I believe Planck's proof because I never saw any reason to doubt it. And having read the linked paper, I still do not see any reason to doubt it. Additionally, I know that the result is right because I know several airtight proofs from reading modern textbooks, often crediting Planck. Admittedly, it is possible that Planck stated a true result but gave a false proof. But it suggests that is proof is probably by-and-large correct. Considering all these things, that is why I believe Planck's proof is not false. My belief is not an especially strong belief, but there you have it.
Feb
10
comment Why is the Pythagorean Theorem used for error calculation?
@LeonardoCastro - Sorry I was speaking loosely and leaving out steps. Thanks for your comments, I just edited, I hope it's better now.
Feb
10
revised Why is the Pythagorean Theorem used for error calculation?
make the math more technically correct
Feb
9
answered Is Planck’s proof of Kirchhoff’s Law of Thermal Emission false; and if it is not false why is it not false?
Feb
6
comment Selection rule used in singlet/triplet recombination in LEDs
@user5419 - No. Nothing in my answer is based on the assumption that light has zero angular momentum. I also never said light "does not couple", only that it couples very weakly.
Feb
4
answered Why is the Pythagorean Theorem used for error calculation?
Feb
3
answered Doesn't the success of statistical physics seem somewhat unreasonable?