发明名称 |
Wavelength monitoring apparatus |
摘要 |
An optical signal emitted from a semiconductor laser is converged by a lens and then received by a single uniaxial birefringent crystal having a C axis that is inclined at an angle other than 90 degrees against a laser optical axis to output an optical signal having a polarized wave component of constant intensity corresponding to the wavelength of the optical signal regardless of temperature changes. The optical signal has an ordinary ray vibrating in a direction perpendicular to a plane including both the C axis and the laser optical axis, and an extraordinary ray vibrating in a direction perpendicular to both the ordinary ray and the laser optical axis. A first main photo detector detects the intensity of a p-polarized component of the optical signal that has passed through a polarizer and a second photo detector directly receives the optical signal converged by the lens.
|
申请公布号 |
US7301974(B2) |
申请公布日期 |
2007.11.27 |
申请号 |
US20030477018 |
申请日期 |
2003.11.07 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
IMAKI MASAO;HIRANO YOSHIHITO;SATOU MAKOTO;MASUDA KENJI;ADACHI AKIHIRO;TAKAGI SHINICHI;NISHIMURA YASUNORI |
分类号 |
H01S3/13;G01J4/04;G01J9/00;H01S5/022;H01S5/0687 |
主分类号 |
H01S3/13 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|