Design of a High Power Laser Diode Driver
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 high-power 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.
Imaging laser radar Laser diode Driver Modulation MOSFET
Wen-jiang Li Qian-qian Wang Li Liu Zhong Peng
School of Optoelectronics,Beijing Institute of Technology,Beijing,China 100081
国际会议
2013 International Conference on Optical Instrument and Technology (OIT’2013)(2013年光学仪器与技术国际会议)
北京
英文
1-8
2013-11-17（万方平台首次上网日期，不代表论文的发表时间）