High repetition frequency narrow pulse laser emission circuit

Abstract

The invention proposes a high repetition frequency narrow pulse laser emitting circuit. It includes a driving circuit and a temperature control circuit of the laser diode; the driving circuit includes a trigger signal source, a charging and discharging circuit and a switching circuit; the driving circuit controls the closing of the switching circuit through the triggering signal, and then controls the frequency and frequency of the laser diode emitting laser through the charging and discharging circuit. pulse width to realize high repetition frequency and narrow pulse laser emission; the temperature control circuit includes a thermoelectric cooler and a peripheral circuit based on a control chip; the thermoelectric cooler is attached to a laser diode for temperature sensing, and the obtained temperature value is input to the The peripheral circuit of the chip, the peripheral circuit realizes the cooling control of the thermoelectric cooler by controlling the chip, thereby reducing the temperature of the laser diode and making it work at a constant temperature. The invention realizes the emission of pulsed laser and effectively improves the working distance and precision of laser ranging.

Description

technical field [0001] The invention belongs to the field of laser measurement, and specifically relates to high-frequency narrow-pulse emission of pulsed lasers, which is applied to intelligent anti-collision of laser radar vehicles, urban construction and planning, laser proximity fuzes, active laser guidance, etc. Background technique [0002] Pulsed laser measurement uses a laser as a light source and a laser as a carrier. According to the time-of-flight principle, the distance is measured by detecting the time difference between the laser emission pulse and the laser echo pulse. It has the advantages of simple structure, low price, high reliability, and anti-interference It has the advantages of strong performance and no need for cooperative targets, and has been widely used in civilian and military applications. [0003] Realizing high repetition frequency and narrow pulse of laser is an important means to improve the working distance, dynamic detection accuracy and an...

AI Technical Summary

Problems solved by technology

However, due to the influence of the semiconductor characteristics of the laser and the distributed inductance and distributed capacitance of the drive circuit, there is a conflicting relationship between the pulse waveform of the laser emission pulse and parameters such as repetition frequency and output power.

The relationship between repetition frequency and pulse width is limited by the maximum duty cycle of the semiconductor laser. In order to obtain a high repetition frequency, the pulse width must be compressed, and the pulse width cannot be narrowed blindly. When the pulse width is narrowed to a certain extent, the peak power drops significantly.

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