发明申请
US20050105569A1 Laser control unit, laser control circuit, and laser-power adjustment method
失效
激光控制单元,激光控制电路和激光功率调节方法
- 专利标题: Laser control unit, laser control circuit, and laser-power adjustment method
- 专利标题(中): 激光控制单元,激光控制电路和激光功率调节方法
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申请号: US10986959申请日: 2004-11-15
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公开(公告)号: US20050105569A1公开(公告)日: 2005-05-19
- 发明人: Hisashi Senga , Toshio Matsumoto , Hiromichi Ishibashi
- 申请人: Hisashi Senga , Toshio Matsumoto , Hiromichi Ishibashi
- 优先权: JP2003-384896(PAT.) 20031114
- 主分类号: G11B7/125
- IPC分类号: G11B7/125 ; H01S3/13 ; H01S5/042
摘要:
A laser control unit, a laser control circuit and a laser-power adjustment method are provided which are capable of controlling laser power precisely, even if an error is produced in the duty of an optical pulse. A light-receiving element 101 converts the optical pulse into an electric signal and outputs a photo-detection signal; an LPF 114 calculates the average value of the optical pulse, based on the photo-detection signal; a DSP 124 calculates a light-emission power value, based on the average value of the optical pulse and the duty of the optical pulse, and calculates the difference between the light-emission power value and a target power value; an EP-ROM 160 stores a correction value for correcting a calculation which is executed by the DSP 124; the DSP 124 corrects the calculation, based on the correction value, and controls an electric-current value which is supplied to a semiconductor laser 150, based on the calculation result which is obtained from the correction; and a laser drive circuit 40 drives the semiconductor laser 150, based on the electric-current value.