Continuously adjustable nanosecond-impulse semiconductor laser driving power supply

Abstract

This invention relates to a continuously adjustable nanosecond semiconductor laser driving power source comprising: a square-wave generator, a shaping amplifier circuit, power amplifier circuit and protective circuit. This inventive power source has characters: (1), continuously adjustable of output pulse parameters such as: peak point current 0-20A, pulsewidth 10-200ns, repetition frequency 1HZ-1MHZ continuously adjustable; (2), having self-power-off protection, it can effectively ensure the semiconductor laser safety working.

Description

technical field [0001] The invention relates to a driving power supply of a semiconductor laser, which is a continuously adjustable nanosecond pulse semiconductor laser driving power supply. Background technique [0002] Pulsed semiconductor lasers have the advantages of small size, high efficiency, long life, and low price, and are now being used more and more widely. It is favored in many fields such as laser communication, laser radar, high-speed photography, pumped solid-state laser, and laser ranging. In order to obtain high-frequency and large-amplitude, nanosecond optical pulses, it is necessary to drive semiconductor lasers with nanosecond electrical pulses. [0003] At present, avalanche transistors, thyristors, insulated gate bipolar transistors and step recovery diodes are often used to obtain electric pulses. The avalanche tube output exciter can obtain better waveforms, but there are still some problems in engineering applications: a single avalanche tube cann...

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Problems solved by technology

The avalanche tube output exciter can obtain better waveforms, but there are still some problems in engineering applications: a single avalanche tube cannot provide a large current, and in order to obtain the current required for work, multiple avalanche tubes need to be used in parallel, which needs to be solved Synchronous triggering, equal distribution of current and other technical problems, otherwise it is easy to produce double peaks or recoil; it is difficult to continuously adjust the output pulse width; avalanche tubes need a large voltage drive, which is easy to produce series in high-frequency signals around

For general field effect tubes, the thyristor switching time is relatively long, and it is difficult to achieve a few ns, which is not suitable for the generation of narrow pulse power supplies.

The narrow pulse current generated by bipolar transistors and step recovery diodes cannot be made very large, and it is difficult to generate large currents

[0004] Since semiconductor lasers are generally expensive, the driving power supply needs to provide an effective protection mechanism. The protection methods for pulsed semiconductor lasers are mainly soft start, power supply filtering, etc., but these are not comprehensive enough.

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