Light source device and optical pickup using light source device

Details Light source device and optical pickup using light source device Light source device and optical pickup using light source device

1992-03-12

1994-07-19

Davie, James W.

Coherent light generators

Particular beam control device

Modulation

359328, 369 4412, 372 22, 372 23, H01S 310

Patent

active

053316509

ABSTRACT:
An SHG element has a semiconductor laser, and a laser resonator for exciting an oscillation line having a predetermined wavelength by making a light beam emitted from the semiconductor laser incident to the laser resonator. The laser resonator converts the wavelength on the oscillation line by a nonlinear optical crystal and emits SHG light having a converted wavelength. The laser resonator uses Nd:YVO.sub.4 as a laser medium for exciting the oscillation line having the predetermined wavelength. The semiconductor laser emits a light beam having power required to obtain the SHG light having predetermined power from the laser resonator when Nd:YVO.sub.4 is used as the laser medium of the laser resonator. A light source device has a semiconductor laser capable of directly modulating light; a wavelength converting section for emitting light having a short wavelength based on LD light from the semiconductor laser; and a device for superposing the LD light from the semiconductor laser on the light having a short wavelength to emit superposed light. An optical pickup uses this light source device.

REFERENCES:
patent: 5038352 (1991-08-01), Lenth et al.
patent: 5268912 (1993-12-01), Tatsuno et al.

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