# Andreas H.

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 Feb12 comment Magnitude of the Fourier Transform of White Noiseyes, that is a typo. I changed it. thanks Feb12 revised Magnitude of the Fourier Transform of White Noiseadded 4 characters in body Feb12 answered Magnitude of the Fourier Transform of White Noise Feb6 comment How does light get into a stable optical cavity in the first place?Hmm, the above image in the original post, only refers to mechanical stability, i.e. how much mechanical tolerance is allowed (so that the resonator is still a resonator). If you e.g. change the mirrors in the plane-parallel configuration to slightly concave mirrors, you have no resonator anymore (the light will bounce off the cavity), Thie is reflected by the fact that if you make g1 and g2 larger than 1 (i.e. the mirrors concave) the region of resonance is left (the red line leaves the region to the topright). Feb6 comment How does light get into a stable optical cavity in the first place?Actually the cavities you show above are all of the Fabry Perot Type, only with different mirror configuration (that is more of a "technical" issue, not a fundamental one). The transmission behavior is in principle the same for all. The ratio of cavity length to wavelength only determines the distance of the "frequency comb" in the transmission (that is the frequency spacing of these). A cavity for optical frequecies does not need to be microscopic, typically it is very macroscopic. And yes all the cavity stuff can be derived by classical (Maxwell) theory. Feb6 comment How does light get into a stable optical cavity in the first place?Hmm, no there is no tradeoff. If the light wavelength matches one resonance of the cavity, it enters the cavity without reflection! Only if the light wavelength does not match a cavity resonance, the mirror (or cavity as whole) will reflect the light. Actually a cavity is a very narrowband filter, that will reflect back light that is off resoance and transmits light that is on resonance. See e.g. the Wikipedia article on the Fabry Perot resonator (there you find transmission curves). Feb6 answered How does light get into a stable optical cavity in the first place? Nov27 answered Impedance Matching Oct19 awarded Supporter Oct15 awarded Teacher Oct15 awarded Editor Oct15 revised Barrier in an infinite double welladded 265 characters in body Oct15 answered Barrier in an infinite double well