Servo-control alignment of nonlinear crystals

Optics: measuring and testing – By alignment in lateral direction – With light detector

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356152, G01B 1126

Patent

active

041870271

ABSTRACT:
An apparatus is disclosed for servo-locking the angular orientation of a nonlinear crystal to the angle at which phasematching occurs for nonlinear optical frequency mixing processes. Two secondary beams are generated from a beam of radiation which is incident upon the crystal. They travel through the crystal at small angles with respect to the main beam and each generates a secondary output beam containing new frequency components produced by the nonlinear optical frequency mixing process in the crystal. A discrimination signal is created by subtracting the generated power at the new frequency component of one of the secondary output beams from the generated power of the other. This signal is sensitive to the angular misalignment of the crystal and is used to drive a servo system to maintain the proper angular orientation for phasematching.

REFERENCES:
patent: 3620599 (1971-11-01), Ashkin
Yariv, Introduction to Optical Electronics, 1971, pp. 189-194.
Kuhl et al., Optics Communications, vol. 13, No. 1, Jan. 1975, pp. 6-12.
Vorsoshilov et al., Soviet Journal of Quantum Electronics, vol. 6, No. 3, Mar. 1976, pp. 326 and 327.

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