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Proceedings Paper

Design of a high power laser diode driver
Author(s): Wen-jiang Li; Qian-qian Wang; Li Liu; Zhong Peng
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Paper Abstract

Laser diodes are preferred light sources for compact non-scanning imaging laser radar systems due to their small volume and easiness to be integrated. Therefore, lots of present studies focus on research of modulation characteristics of highpower laser diodes. A high-frequency modulated driver for a compact non-scanning imaging laser radar system is described in this paper. It is based on linear constant current theory and can modulate a high power laser diode quasi-continuously. A high-speed operational amplifier is used to drive a power MOSFET, which can take full advantages of the power MOSFET–low driver current and good dynamic characteristics. In addition, an operational amplifier and PI (Proportion-Integration) control are applied in a negative feedback network to improve the current stability further. In order to avoid damaging the laser diode, a slow start circuit and over-current protection circuit have also been designed. The maximum current of the over-current protection circuit can be set according to the requirement. In addition, the power supply can also be switched between CW and QCW operating modes. When the high power semiconductor laser is modulated by large signal, some nonlinear effects will occur such as turn-on delay, relaxation oscillation and modulation chirp. Some theoretical analysis and experimental research on some nonlinear effects have also been done. Experimental results are consistent with theoretical analysis by using this driver for a 1W GaAs quantum well laser.

Paper Details

Date Published: 31 December 2013
PDF: 8 pages
Proc. SPIE 9042, 2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 90421D (31 December 2013); doi: 10.1117/12.2038049
Show Author Affiliations
Wen-jiang Li, Beijing Institute of Technology (China)
Qian-qian Wang, Beijing Institute of Technology (China)
Li Liu, Beijing Institute of Technology (China)
Zhong Peng, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 9042:
2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Xiaocong Yuan; Yunlong Sheng; Kimio Tatsuno, Editor(s)

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