Is there an optical frequency divider that works to make 1064nm light from 532nm light?

The opposite of KDP crystals?

  • $\begingroup$ I am not aware that this is possible without using a second source. It can certainly not be done as an elementary process, since the total angular momentum would be wrong. $\endgroup$
    – CuriousOne
    Feb 27, 2016 at 21:48
  • $\begingroup$ The second sentence is misleading - nonlinear crystals such as KDP are used both for up- and down-conversion of the frequency. Opposite of KDP is again KDP. $\endgroup$
    – dominecf
    Feb 27, 2016 at 22:28
  • $\begingroup$ Are you hoping to make two photons from one? Or is a chemical (fluorescent) transition good enough for you? $\endgroup$
    – Floris
    Feb 27, 2016 at 23:01

1 Answer 1


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.

  • $\begingroup$ For another method, ee advr-inc.com/quantum.html $\endgroup$ Feb 27, 2016 at 21:54
  • 2
    $\begingroup$ In fact, a properly tuned optical parametric oscillator does exactly what the original question asked for, and thanks to the presence of a resonator, it can be very efficient. $\endgroup$
    – dominecf
    Feb 27, 2016 at 22:30

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