Wavelength conversion device

Details Wavelength conversion device Wavelength conversion device

2005-02-04

2008-11-25

Sanghavi, Hemang (Department: 2874)

Optical: systems and elements

Optical frequency converter

C359S328000, C372S022000

Reexamination Certificate

active

07457030

ABSTRACT:
The energy conversion efficiency from light that is to be converted to converted light of a wavelength conversion device is adjusted so as always to be kept stably at a maximum. The wavelength conversion device is provided with a laser light source10for generating a fundamental wave light, a nonlinear optical crystal16into which the fundamental wave light is made to enter to generate converted light, and an optical path adjusting portion30for adjusting the direction of propagation of the fundamental wave light and the position of the light beam of the fundamental wave light in order to make the fundamental wave light enter the nonlinear optical crystal16while satisfying phase matching conditions. The optical path adjusting portion30is constituted so as to be provided with a first reflecting mirror12and a second reflecting mirror14,and the first reflecting mirror is provided with adjustment means driven by motors M1and M2,and the second reflecting mirror is provided with adjustment means driven by motors M3and M4.Additionally, the wavelength conversion device is provided with a semi-transparent mirror18for splitting off and taking out one portion of output light17,and a photodetector22for detecting this split off output light. An electrical signal23that is output from the photodetector22is input into an adjustment value calculating means26,and in this adjustment value calculating means, the necessary adjustment values for the adjustment means in the optical path adjusting portion30are calculated using fuzzy inference, and this result is output to an optical path adjusting portion control device28.The optical path adjusting portion control device28carries out adjustment of the optical path based upon output signals27from the adjustment value calculating means26.

REFERENCES:
patent: 2007/0025401 (2007-02-01), Hayashi et al.
patent: 6-125515 (1994-05-01), None
patent: 8-234144 (1996-09-01), None
patent: 10-325970 (1998-12-01), None

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