Temperature controller of small semiconductor laser

Abstract

The invention adopts comparison circuit to build temperature control circuit. It consists of four parts that are temperature sampling, temperature setting, temperature comparison and control, and temperature adjustment. It is different from the temperature control devices adopting pulse width modulator, D / A conversion and feedback analogue circuit. The invention can adjust working temperature of laser within 20-30deg.C, temperature error is less than or equal to minus or plus 1deg.C.

Description

Technical field: [0001] The invention relates to a temperature control device for a semiconductor laser, in particular to a small semiconductor laser temperature control device for single tube pumping of a laser diode. Background technique: [0002] Semiconductor laser is a kind of electroluminescent device, and the small semiconductor laser pumped by laser diode single tube has a wide range of applications in the fields of landscape engineering and optical communication. When a stable current is input to the semiconductor laser to pump the laser diode, it will emit laser light with a certain wavelength. However, when the laser works continuously, due to the heating of the pump laser diode and the working medium, the output optical power of the pump source laser diode decreases, the central wavelength drifts, and the working conditions of the working medium change, resulting in a decrease in the output optical power of the laser, and the center of the output light Frequency...

AI Technical Summary

Problems solved by technology

For a long time, the research on the temperature control device of semiconductor lasers has mainly formed two types of schemes. One is the digital-to-analog conversion temperature control device using a pulse width modulator (PWM), which can achieve more accurate temperature control, but its circuit structure is more complicated. Complicated, it generally involves multiple parts such as temperature sampling, analog-to-digital conversion, digital logic, digital-to-analog conversion, amplifier circuit and temperature regulation circuit, among which the digital logic circuit part mostly uses single-chip microcomputers and even some such devices in order to achieve more accurate Temperature control needs to use computer for high-end control and realize it through software algorithm, so its development cost is relatively high, and it is not suitable for temperature control of small lasers

Another solution is to use a feedback analog circuit, but this type of temperature control device is a fixed temperature operating point. Once the circuit is completed, its stable working temperature will be fixed.

However, different types of lasers require different operating temperatures, and it is difficult for such devices to adjust the stable operating temperature

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