SHG laser stabilizing control device and optical disk recording/

Details SHG laser stabilizing control device and optical disk recording/ SHG laser stabilizing control device and optical disk recording/

1998-05-06

2000-10-10

Font, Frank G.

Coherent light generators

Particular beam control device

Optical output stabilization

372 22, 372 38, 372 46, H01S 310, H01S 313, H01S 300, H01S 500

Patent

active

06130901&

ABSTRACT:
The SHG laser stabilizing control device of this invention has: an SHG laser having a semiconductor laser having a wavelength which changes in a step-wise manner in response to a change in a wavelength-changeable current and a wavelength conversion element which converts the wavelength of output light of the semiconductor laser into a shorter wavelength; an optical detection section for detecting a step-wise change in the wavelength of output light of the SHG laser; a current changing section which changes the wavelength-changeable current supplied to the semiconductor laser in order to change the wavelength of the semiconductor laser; and a wavelength-changeable current control section which obtains a gap current value of the wavelength-changeable current at which the step-wise change in the wavelength is detected by the optical detection section and adds or subtracts a predetermined current value to or from the gap current value to set a wavelength-changeable current value.

REFERENCES:
patent: 5428700 (1995-06-01), Hall
patent: 5663980 (1997-09-01), Adachi
Kazuhisa Yamamoto et al., "Milliwatt-Order blue-light generation in a periodically domain-inverted. LiTaO.sub.3 waveguide", Aug. 1, 1991, Optics Letters, vol. 16, No. 15 (pp. 1156-1158).

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