Can I decrease a photon's wavelength by a medium or a vacuum? Are there other ways of decreasing the wavelength?
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3Gravity. http://en.wikipedia.org/wiki/Pound%E2%80%93Rebka_experiment – user6972 Aug 11 '13 at 17:41
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Possibly Related: http://physics.stackexchange.com/questions/13675/does-the-wavelength-always-decrease-in-a-medium?rq=1 – Joe Aug 11 '13 at 17:52
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1There are non-linear optical processes like frequency doubling, but you don't get something for nothing (of course), you lose photon count in doing it. – dmckee --- ex-moderator kitten Aug 11 '13 at 18:21
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Just to mention the basics for "other ways"', you can hit your photon really hard with a fast moving electron or proton, i.e. inverse Compton scattering. ICS is very important in many astrophysical contexts. If you even reflect the photon off a moving mirror, you can slightly increase or decrease its wavelength
Jim Graber
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