发明名称 |
FREQUENCY STABILISED SEMICONDUCTOR LASER |
摘要 |
The output frequency of a semiconductor laser beam is stabilised using a grating or another optical device which has an interaction with the beam whose parameters are sensitive to the beam frequency. The grating (130) generates positive and negative first order diffracted beams (132, 134), whose angle of diffraction is sensitive to the beam frequency, and is detected by split photodetectors AB, CD respectively. In the event of a change in beam frequency the outputs from the photodetectors AB, CD will vary to provide an error signal for stabilising the laser frequency. This error signal is insensitive to variations in angular alignment between the beam and the diffraction grating. This is because variations in frequency and variations in angular alignment cause different changes in the outputs of the photodetectors AB, CD. An error signal insensitive to frequency is generated in this example by combining the photodetector outputs in the following way (A+D)-(B+C). |
申请公布号 |
WO9904466(A1) |
申请公布日期 |
1999.01.28 |
申请号 |
WO1998GB02141 |
申请日期 |
1998.07.17 |
申请人 |
RENISHAW PLC;COPNER, NIGEL, JOSEPH;CHANEY, RAYMOND, JOHN |
发明人 |
COPNER, NIGEL, JOSEPH;CHANEY, RAYMOND, JOHN |
分类号 |
H01S3/13;H01S3/139;H01S5/0687 |
主分类号 |
H01S3/13 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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