Active Q-switched fiber laser pulse width adjusting system

Abstract

The invention relates to an active Q-switched fiber laser pulse width adjusting system, and belongs to the technical field of photoelectrons. The system comprises a pump laser, a reflective fiber bragg grating, a doped fiber, a fiber power stripper, an acousto-optic fiber Q switch, an output fiber bragg grating, an acousto-optic fiber Q switch driver, a pump laser driving power supply and a control unit, the pump laser, the reflective fiber bragg grating, the doped fiber, the fiber power stripper, the acousto-optic fiber Q switch and the output fiber bragg grating are sequentially connected inseries; the pump laser driving power supply, the control unit and the acousto-optic optical fiber Q switch driver are sequentially connected in series; the pump laser driving power supply is communicated with the pump laser; the acousto-optic optical fiber Q switch driver is communicated with the acousto-optic optical fiber Q switch; according to the invention, the Q switch turn-on time is optimized, 10ns-level pulse width and higher power output can be obtained, and tunable pulse width output can be obtained through a table look-up method.

Description

Technical field [0001] The invention belongs to the technical field of optoelectronics, and relates to an active Q-switched fiber laser pulse width adjustment system. Background technique [0002] Pulsed fiber laser has the advantages of compact structure, good heat dissipation performance, high conversion efficiency, excellent beam quality and stable performance. At present, through the active Q-switched pulsed fiber laser solution, pulsed fiber lasers with good beam quality have been achieved. They are widely used in various industrial processing industries such as laser marking, laser surface treatment, laser engraving, and metal material processing. Broad application areas are expanded. [0003] In the pulsed fiber lasers reported so far, the seed source can be realized in two main ways. One adopts an active Q-switched pulsed fiber laser, and the output pulse width is generally 100ns. This method has a simple structure, low cost, and high output power. , It is beneficial to t...

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Problems solved by technology

[0003] In the currently reported pulsed fiber lasers, there are mainly two ways to realize the seed source. One is the active Q-switched pulsed fiber laser method, and the output pulse width is generally 100ns. This method has simple structure, low cost and high output power. , which is beneficial to the subsequent stage MOPA amplification, but generally the output pulse width is wider, and the general pulse width cannot be adjusted; another method is realized by semiconductor modulation, which can obtain a narrower pulse width output, and the pulse width is adjustable, but The output power is small, which is not conducive to post-stage amplification

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