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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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Possibly Related:… – Joe Aug 11 '13 at 17:52
There 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 Aug 11 '13 at 18:21
up vote 1 down vote accepted

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

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