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I have a laser with a wavelength of 650 nm (visible red light) and was wondering if there is some sort of material that could be used to absorb and disperse a different frequency of light around (900 nm).

Energy would just be dissipated by the material as it is converted to a lower frequency,

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  • $\begingroup$ I just thought that it possible to red-shift but that would take a far enough distance, so that solution is impractical. $\endgroup$
    – AlanZ2223
    Dec 21, 2014 at 5:23
  • $\begingroup$ You realize of course that any absorptive material will do that through black body radiation but it will be a dispersed spectrum? You want a coherent beam out of this, or at least a beam? rp-photonics.com/frequency_doubling.html for doubling frequency exists, not for halving though . $\endgroup$
    – anna v
    Dec 21, 2014 at 5:39
  • $\begingroup$ Yes I am looking for a directed beam. It should proceed like this: I take a red laser and direct it at the material and on another end a beam or one with little divergence is dispersed $\endgroup$
    – AlanZ2223
    Dec 21, 2014 at 6:32
  • $\begingroup$ What you are looking for is another laser. A converting material will not do. $\endgroup$
    – CuriousOne
    Dec 21, 2014 at 7:39
  • $\begingroup$ Check out "CARS" and "CSRS" -- Stokes formalism for mixing wavelengths in a nonlinear material to generate sum/difference wavelengths. $\endgroup$ Dec 21, 2014 at 13:17

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I found a link for halving too:

Nonclassical light generation in the process of self-frequency halving in a periodically poled active nonlinear Nd:Mg:LiNbO3 crystal

Nonclassical light generation at self-frequency halving in periodically poled active nonlinear crystals is studied. The squeezing spectra of fundamental radiation and its subharmonic are investigated for a periodically poled Nd:Mg:LiNbO3 crystal.

It seems to be a matter of research at the present time, not something available for any laser beam in the manner you envisage.

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Assuming when you say the output is "dispersed" you mean it is incoherent and radiating in all directions, what you are asking for is a fluorescent material.

A Google search for "IR fluorescence" finds a couple of companies making these materials for biological sample marking, however the ones I checked into further need a slightly longer excitation wavelength to work efficiently.

If you actually want a coherent output beam, these or similar materials might be usable as the active medium in a dye laser to be pumped by your 650 nm beam.

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