Semiconductor laser temperature control system based on TEC

Abstract

The invention relates to a semiconductor laser temperature control system based on TEC. It is characterized in that the temperature control system comprises a temperature sensor, a one-chip microcomputer, a TEC digital PWM power drive circuit and a TEC heat dissipation module. The TEC heat dissipation module comprises a TEC, a refrigeration block, a heat dissipation aluminum plate and an exhaust fan. The cold surface and the hot surface of the TEC are both coated with heat conducting silicone grease. The cold surface of the TEC is clung to the refrigeration block and the hot surface of the TEC is clung to the heat dissipation aluminum plate. The exhaust fan is arranged under the heat dissipation aluminum plate; one end of the temperature sensor is connected with the semiconductor laser, and the other end is connected with an input-output pin of the one-chip microcomputer; the PID algorithm is stored inside the one-chip microcomputer; the output end of the one-chip microcomputer is connected with one end of the TEC digital PWM power drive circuit; the other end of the TEC digital PWM power drive circuit is connected with a TEC wiring terminal of the TEC heat dissipation module; the circuit structure of the TEC digital PWM power drive circuit is that a base of a triode Q1 is connected with the output end of the one-chip microcomputer; the output end of the one-chip microcomputer is connected with a power supply terminal VCC through a resistor R2.

Description

technical field [0001] The invention relates to the technical field of temperature control, in particular to a semiconductor laser temperature control system based on TEC. Background technique [0002] So far, semiconductor lasers have been developed for more than 50 years. In just a few decades, the performance of semiconductor lasers has been significantly improved in all aspects. As a new type of light source, semiconductor lasers have been more and more widely used in communication, military, medical and other fields because of their small size, light weight, high efficiency, low power drive, and direct modulation. However, the semiconductor laser's output wavelength, threshold current, service life, output power, etc. are all affected by temperature, which limits the use of the laser. Therefore, the temperature control of the semiconductor laser plays a very important role in the application of the laser. [0003] At present, there are two main types of temperature con...

AI Technical Summary

Problems solved by technology

[0004] CN104331102A discloses a kind of " laser temperature control circuit based on TEC ", and this control circuit has used NTC thermistor to measure temperature signal as temperature sensor, uses the MAX1978 special-purpose temperature control chip of MAXIM company, but this chip is expensive, and NTC The design circuit is complex, and the temperature error of the measurement result is relatively large. In addition, the patent does not dissipate heat from the hot end of the TEC in time, making the temperature control effect poor.

Images