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A grating may be used to extract second harmonic light from a nonlinear crystal even when the crystal is lossy at the second harmonic frequency.
English (United States)
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Grating Coupling Of Light Generated by Forced Nonlinear Optical
A grating may be used to extract second harmonic light from a nonlinear
crystal even when the crystal is lossy at the second harmonic frequency.
The nonlinear susceptibility of a medium can be very large when the
generated light frequency is near to or within an absorption region of the medium.
Nonlinear generation of light can thus be very efficient at such frequencies.
However, this light is ordinarily not available because of the strong absorption of
the medium. This phenomenon has limited the wavelengths at which a given
material may be used for generation of light by nonlinear processes to those
frequencies at which there is no strong absorption. The described structure
overcomes this limitation.
Light produced at frequency w by a nonlinear process can be
described as being composed of two parts, a free wave propagating
with the (possibly complex) wave vector appropriate to w, and a
forced wave propagating with a wave vector equal to the sum of the
wave vectors of the fundamental beams. Normal phase matching in a
lossless material occurs when these two waves combine constructively.
When the material is strongly absorbing at w, the amplitude of the
light at w does not grow with distance, but has a constant value at
all points in the material. Heretofore, only the light at w generated
very close to the exit surface of an absorbing nonlinear material
could be observed.