Optical pulse detection and protection circuit for fiber laser

Abstract

The invention relates to an optical pulse detection and protection circuit for a fiber laser, which comprises an optical pulse signal amplifying circuit, a comparison circuit and a monostable trigger circuit. The optical pulse signal amplifying circuit is connected with the monostable trigger circuit through the comparison circuit, the monostable trigger circuit changes charge-discharge time of amonostable trigger chip by setting the resistance value of a programmable potentiometer under different frequencies through a single chip microcomputer, accordingly, whether compared optical pulse digital signals are normal or not is detected, and the monostable trigger circuit outputs TTL (transistor-transistor logic) low level if the optical pulse digital signals are abnormal, and outputs TTL high level if the optical pulse digital signals are normal. The single chip microcomputer detects output signals of the monostable trigger circuit, and a power supply is immediately turned off once thesingle chip microcomputer detects that the monostable trigger circuit outputs the TTL low level, so that iridium-doped fibers are protected from excessive burnout. The optical pulse detection and protection circuit functions in protecting the pulse laser in real time, so that the pulse laser can be effectively prevented from failing and burning the iridium-doped fibers.

Description

technical field [0001] The invention relates to an optical pulse detection and protection circuit for a fiber laser. Background technique [0002] Due to many advantages such as low price, compact structure, high efficiency, narrow line width, and tunable wavelength, Q-switched double-clad fiber lasers are widely used in many fields such as remote sensing, ranging, medical, military, industrial processing, nonlinear optical applications, etc. widely used. [0003] At present, the fiber laser protection circuit is realized by detecting the average value of the optical pulse signal. This solution is to amplify the optical signal and then convert the optical pulse signal to a DC signal, and compare it with a set reference point to realize the protection of the pulsed laser. This protection can only be used for those with no optical signal output Only in this case can it play a protective role. However, if the seed source leaks the pulse signal or the frequency is incomplete,...

AI Technical Summary

Problems solved by technology

However, if the seed source leaks the pulse signal or the frequency is incomplete, it will also cause the pulsed laser to burn out the fiber.

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