Research of precise temperature control systems of high-power semiconductor lasers
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Wuhan National Laboratory for Optoelectronics, Huazhong University of Science & Technology, Wuhan 430074, China
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Corresponding author:
DUAN Jun, duans@hust.edu.cn
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Received Date:
2014-04-25
Accepted Date:
2014-05-21
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Abstract
In order to reduce the influence of temperature on output wavelength and power stability of semiconductor lasers, a constant current module was designed to drive thermoelectric cooler. The cooling capacity of the thermoelectric cooler was controlled by changing the current of the constant current module. The optimal control parameters of proportion-integration-differentiation algorithm were set to realize high precision temperature control. The system consists of high precision temperature measurement circuit, control core of DSP F28335, thermoelectric cooler control circuit, human-computer interaction and communication module. Constant temperature control was realized for a 50W high power laser diode at 5℃~26℃ ambient temperature, the temperature control accuracy reached 0.02℃ at 15℃~45℃. The results show that this system has a wide temperature control range and high control precision, which satisfies the requirement of temperature control of high power semiconductor lasers.
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