Is there an optical frequency divider that works to make 1064nm light from 532nm light?
The opposite of KDP crystals?
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Optical parametric down conversion; this can be accomplished with a variety of non-linear crystals, such as BBO. Efficiency depends upon matching of energy and momentum conditions with the proper direction through the crystal; as you move away from the well matched case, it can be quite inefficient. For an example of an efficient case, see High-conversion-efficiency optical parametric chirped-pulse amplification system using spatiotemporally shaped pump pulses
It is used as a source of entangled photons.