Narrow nanosecond active Q-switched fiber laser

Abstract

The invention relates to a narrow nanosecond active Q-switched fiber laser, which belongs to the technical field of photoelectrons. The fiber laser 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 and a cavity, wherein 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 in series. The cavity is of a horizontally-placed hollow tubular structure. Thedoped fiber, the optical fiber power stripper and the acousto-optic fiber Q switch are arranged in the cavity. One axial end of the reflective fiber bragg grating is in contact with one axial end of the cavity. One axial end of the output fiber bragg grating is in contact with the other axial end of the cavity. According to the invention, the transition time of a pulse in the fiber laser cavity isreduced; and the narrow-pulse-width pulse fiber laser output of which the pulse width is smaller than 20ns is obtained under the condition that a high-speed acousto-optic Q switch does not need to beadopted.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, and relates to a narrow nanosecond active Q-switching fiber laser. Background technique [0002] The advantages of pulsed fiber lasers, such as compact structure, good heat dissipation, high conversion efficiency, excellent beam quality and stable performance, have attracted widespread attention. At present, through the active Q-switched pulsed fiber laser solution, the pulsed fiber laser with good beam quality has been widely used in various industrial processing industries such as laser marking, laser surface treatment, laser engraving, metal material processing, etc. Expansion of broad application fields. [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. , wh...

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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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