Semiconductor laser temperature controller

Abstract

A semiconductor laser temperature controller comprises a precision reference source, a temperature sampling unit, a temperature setting unit, a temperature error amplifying unit, a sawtooth wave generator, a PWM (pulse width modulation) signal generator and a power conversion stage, the precision reference source supplies precision reference voltage to the temperature sampling unit and the temperature setting unit, the temperature sampling unit and the temperature setting unit output signals and input the error signal between the actual temperature generated by the temperature error amplifying unit and set temperature, the error signal and the sawtooth wave generated by the sawtooth wave generator are simultaneously inputted into the PWM signal generator, so that a pulse width modulation signal is generated, and therefore the voltage output of the power conversion stage is controlled to drive a semiconductor chilling plate TEC to control temperature. The semiconductor laser temperature controller has the advantages of simple structure, high efficiency and low cost, realizes a temperature control function, and can regulate the stable operating temperature of a semiconductor laser according to needs, and the temperature error is less than or equal to positive or negative 0.5 DEG C.

Description

technical field [0001] The invention relates to a temperature control device for a semiconductor laser. Background technique [0002] Semiconductor laser is an electroluminescent device, which has the advantages of small size, long life, easy modulation, simple structure, pumping by current injection, and high conversion efficiency. It is widely used in laser communication, laser printing, ranging, laser radar and laser jamming. However, when the laser works continuously, the laser itself will generate a large amount of heat energy, resulting in an increase in temperature, which will have an important impact on the output wavelength, laser output power and life of the semiconductor laser. Especially in semiconductor-pumped solid-state lasers, temperature changes will cause the output wavelength of the semiconductor laser as the pump source to drift, making the laser output power of the laser unstable, so the semiconductor laser must be controlled to work in a stable tempera...

AI Technical Summary

Problems solved by technology

However, when the laser works continuously, the laser itself will generate a large amount of heat energy, which will cause the temperature to rise, which will have an important impact on the output wavelength, laser output power and life of the semiconductor laser.

Especially in semiconductor-pumped solid-state lasers, temperature changes will cause the output wavelength of the semiconductor laser as the pump source to drift, making the laser output power of the laser unstable, so the semiconductor laser must be controlled to work in a stable temperature state Down

For a long time, there are generally two schemes for the temperature control device of semiconductor lasers. One is to adopt a linear scheme, and the power device works in a linear state. This scheme is low in cost but low in efficiency; the other is a switching scheme, using 4 power devices. Form an H bridge to make the power device work in the switch state, with high efficiency, but the solution is complex and costly

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