Description: realization of a wavelength
shifter based on cascaded second-order processes
in the organic molecular crystal N-(4-
nitropheny1)-L-prolinol (NPP).’ In our experiment,
a pump pulse p at frequency wp and
a signal pulse s at w, - wp interact to generate
the frequency-shifted signal fat wf= 20, - w,.
Defining q as the ratio of the energy off at the
output to sat the input, the goal is to achieve q
= 1 with a moderate pump intensity.
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