Modulated High Power and Narrow Pulse Width Laser Drive Circuit for Lidar System

Electronics

Jun Shu¹  Jian Qiu¹  Yingying Yan¹  Kefu Liu¹  Zhiwen Chen¹ 

[1] School of Information Science and Technology, Fudan University, Shanghai 200433, China;

关键词: laser drive circuit;    TOF Lidar system;    GaN devices;    power modulation;   

DOI  :  10.3390/electronics10070823

来源: DOAJ

【 摘 要 】

This manuscript introduces a laser drive circuit for a light detection and ranging (Lidar) system. A Lidar system usually requires its drive circuit to provide laser pulses with nanosecond pulse width, > 100 W peak power and high repetition frequency. However, the existing research results show difficulties in meeting these requirements. In order to reduce the pulse width and increase the peak power of laser pulses, special circuit design and component selection are used to optimize the parasitic parameters of the drive circuit, and GaN devices are used to increase the switching speed. The characteristics of laser pulses are tested under different input voltage, pulse per second and switch conducting time. Meanwhile, the reasons for the changes in these characteristics are analyzed and explained. In order to meet the requirements of the Lidar system to detect targets at different distances, a modulation method to change the peak power of the laser pulse is proposed. In our experiment, ideally, the peak power of the laser pulse reaches 135 W, and the pulse width is less than 2 ns at a pulse per second rate of 400 kHz.

【 授权许可】

Unknown