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- W1965061541 abstract "The basic relations of geometrical optics for the case of an isotropic, time-dependent medium are derived from Fermat’s principle. The time-dependent theory is applied by discussing the Debye-Sears effect and the frequency fluctuations in a plane light wave induced by atmospheric turbulence and a steady cross wind. In the former case it is shown that the Brillouin scattering relation Δω = VΔk holds in the geometrical optics limit where V is the sound velocity, while in the latter case we find, using a method due to Tatarski, that the fluctuations in frequency are of the order of a few kilohertz under the most extreme conditions of turbulence, wind speed, and range. The intensity law of geometrical optics, Iσ = constant, is generalized to read Iσ/ν2 = constant, where ν is the frequency of the light wave." @default.
- W1965061541 created "2016-06-24" @default.
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- W1965061541 date "1976-10-01" @default.
- W1965061541 modified "2023-09-26" @default.
- W1965061541 title "Time-dependent geometrical optics" @default.
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- W1965061541 doi "https://doi.org/10.1364/josa.66.001042" @default.
- W1965061541 hasPublicationYear "1976" @default.
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