A narrow nanosecond active Q-switched fiber laser

Abstract

The invention relates to a narrow nanosecond active Q-switched fiber laser, belonging to the field of optoelectronic technology; including a pump laser, a reflective fiber grating, a doped fiber, a fiber power stripper, an acousto-optic fiber Q switch, an output fiber grating and a cavity ; Among them, the pump laser, reflective fiber grating, doped fiber, fiber power stripper, acousto-optic fiber Q switch and output fiber grating are connected in series in sequence; the cavity is a hollow tubular structure placed horizontally; doped fiber, fiber power stripped The device and the acousto-optic fiber Q switch are arranged in the cavity; and the axial end of the reflective fiber grating is in contact with the axial end of the cavity; the axial end of the output fiber grating is in contact with the other axial end of the cavity; the invention reduces The transit time of the pulse in the fiber laser cavity is shortened, and a pulsed fiber laser output with a narrower pulse width of less than 20 ns can be obtained without using a high-speed acousto-optic Q switch.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and relates to a narrow nanosecond active Q-switched fiber laser. Background technique [0002] Pulsed fiber lasers have attracted extensive attention due to their compact structure, good heat dissipation, 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, which are widely used in various industrial processing industries such as laser marking, laser surface treatment, laser engraving, metal material processing, etc. Broad application field expansion. [0003] In the currently reported pulsed fiber lasers, there are mainly two ways to realize the seed source. One is to use active Q-switched pulsed fiber laser, and the output pulse width is generally 100ns. This method is simple in structure, low in cost and high in output power. , w...

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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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