Constant Power System for Semiconductor Laser Based on DSP2812

doi:10.3969/j.issn.1000-1093.2020.11.014

Abstract

Abstract: For the reduction in north-seeking accuracy caused by the power change of semiconductor laser in a gyroscope prototype, a constant power control system based on DSP control is designed. Its principle is that the output power of the laser is proportional to the driving current above the threshold current, and the reference current is set. The difference between the measured current and the reference current is used as the feedback signal. The use of components in hardware is minimized to improve the reliability of the system while meeting the design requirements. In the design, the differential current is used to realize negative feedback. The constant control of laser power is realized through the combination of hardware and software. The experimental results show that the proposed control method can be used to improve the output power stability of the laser by 50% compared with the control method without power stabilization circuit. The output power stability of the laser is basically kept at 4.65 mW. The north-seeking accuracy of gyroscope is improved by about 70%, which greatly improves the north-seeking performance of gyroscope.

Key words: semiconductorlaser, constantpowercontrol, negativefeedback, gyronorthfinding

CLC Number:

TN365

TAN Lilong， WANG Peng， ZHONG Qiyuan， ZHANG Cui. Constant Power System for Semiconductor Laser Based on DSP2812[J]. Acta Armamentarii, 2020, 41(11): 2266-2273.

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