Multi quasi phase matched interactions in a non-linear crystal a

Details Multi quasi phase matched interactions in a non-linear crystal a Multi quasi phase matched interactions in a non-linear crystal a

1997-05-20

1998-06-16

Healy, Brian

Coherent light generators

Particular beam control device

Nonlinear device

372 22, 372 23, 372 94, 372 98, 372 99, 372108, 359330, H01J 310, G02F 135

Patent

active

057683026

ABSTRACT:
A laser system in which an intense laser beam of a predefined pumping wavelength traverses a non-linear material, such as crystalline lithium niobate, that has been impressed with one or more quasi phase matching (QPM) gratings is disclosed. Quasi phase matching compensates for the dispersion or birefringence in a non-linear material by modulating the non-linearity with the proper period such that the different wavelengths involved in the non-linear process stay in phase over a long interaction length. The first QPM grating promotes the parametric generation of a resonant signal whose wavelength is determined by the grating period. According to the invention, either a second QPM grating impressed in the same medium or a different order of the first QPM grating promotes the non-linear interaction between the resonant signal and another optical signal traversing the non-linear material. The multi-step process allows efficient generation of high power radiation in wavelength regions, such as the blue, or red, not easily accessible otherwise.

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