Laser device wide-temperature circuit

Abstract

The invention relates to the field of laser application, in particular to the field of the laser application with more strict temperature change requirement. The invention provides a laser device wide-temperature circuit which achieves that the size is small, and the upper limit of current is set with high accuracy, dynamic regulation is achieved with drive current, laser power is controlled with high accuracy, and response to the temperature change is minimal. The laser device wide-temperature circuit comprises a bias module, a laser power signal module, a power duty radio module, and a drive current module, wherein the bias module and the laser power signal module are both connected with the power duty radio module, and the power duty radio module is connected with the drive current module. According to the laser device wide-temperature circuit, a laser drive circuit with small size, wide temperature and low temperature drift is achieved. The laser device wide-temperature circuit is high in integration level, strong in transportability, easy to process and assemble, and economical in cost. The laser device wide-temperature circuit can be used in the fields of military, measurement and other fields with more strict requirements on size and which need a wider range of temperature.

Description

[0001] technical field [0002] The invention relates to the field of laser application, especially the field of laser application with relatively strict temperature change requirements. Background technique [0003] With the continuous development of science and technology, the application scope of laser is also expanding rapidly, such as: medical equipment, construction measurement, instruction, military, aerospace and so on. Applications in these areas require stable power output of the laser, and stricter requirements on durability. This puts forward two requirements for the drive circuit: 1. The laser setting power value should be stable and not change with temperature. 2. The drive circuit must have a stable upper limit current to prevent the laser from being burned by automatic control to increase the drive current when the laser output power is not enough. [0004] At present, the laser drive circuits on the market work normally at room temperature. The laser power...

AI Technical Summary

Problems solved by technology

[0004] At present, the laser drive circuits on the market work normally at room temperature. The laser power control circuit generally drives the triode directly through the operational amplifier as a comparator. The comparator output has two states Vmax and Vmin. By changing the duty cycle To achieve power stability control, the upper limit current is achieved by setting the base resistance value of the triode to reach the target current value. Such current limitation is realized by the magnification β value of the triode, and there is no temperature compensation device, and the current limit value changes with temperature. At low temperature or high temperature, the parameters of the entire circuit will drift greatly, and there are many shortcomings: 1. The set power of the laser drifts, which makes the laser overwork and damages the performance of the laser

2. The upper limit current changes. At low temperature, the upper limit current will become very low, and it is almost impossible to drive the laser normally. At high temperature, the current will be too high, which will damage the performance of the laser.

3. The large volume is not conducive to the application in important fields such as military affairs

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