Two-stage temperature control system for semiconductor laser

Abstract

The present invention discloses a two-stage temperature control system for a semiconductor laser. The two-stage temperature control system for the semiconductor laser comprises a first stage temperature control subsystem, a second stage temperature control subsystem, a temperature display subsystem and a power supply subsystem. The first stage temperature control subsystem acts on a semiconductor laser diode (LD) and employs an analog PID control mode; and a negative temperature coefficient thermistor (NTC) is selected as a thermometric element, and a semiconductor cooler (TEC) is selected as an actuator. The second temperature control subsystem is configured to control the temperature of the whole temperature control system and maintain a stable operating ambient temperature of a circuit; and the second temperature control subsystem employs digital PID and PWM control algorithms, the NTC is selected as a thermometric element, and the TEC and a cooling fan are selected as the actuator. The temperature display subsystem is configured to display setting temperature and real actual temperature of the first stage temperature control subsystem and the second stage temperature control subsystem. The power supply subsystem is configured to provide a power supply required by the operation of the circuit. Through the adoption of two-time temperature control, the influence of element temperature drift on the control accuracy is decreased, the control accuracy is improved, the working life of the system may be prolonged, and the long-time stability of the system is improved.

Description

technical field [0001] The invention relates to the technical field of temperature control of semiconductor lasers, in particular to a two-stage temperature control system for semiconductor lasers, which can be used for high-precision temperature control of semiconductor lasers. Background technique [0002] Semiconductor lasers have the advantages of high efficiency, low power consumption, small size, light weight, low price, high reliability, and long service life. They are widely used in military, medical, communication, national defense, scientific research, processing and other fields. The performance of a semiconductor laser is mainly affected by its output power and frequency, and the frequency and power of a laser have a strong dependence on temperature. Therefore, long-term high-precision temperature control of semiconductor lasers is required. [0003] The current semiconductor laser temperature control system—whether it is analog or digital—uses a first-level tem...

AI Technical Summary

Problems solved by technology

At present, the bridge circuit of most products adopts the method of resistive voltage division. The relationship between the voltage difference of the bridge arm and the resistance is nonlinear, which is not conducive to improving the accuracy of the control system.

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