Light source device and optical pickup using light source device
US5331650A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1992 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Mar 12, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/1673
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.