Ultrasound-induced long-period fiber grating Q-switched pulsed and continuous-purpose fiber laser

Abstract

The invention discloses an ultrasonic-induced long-period fiber grating Q-switched pulse and continuous dual-purpose fiber laser, which includes a total reflection fiber grating, a double-clad doped fiber, a wavelength division multiplexer, a pump source, an output fiber grating and an output tail. fiber; also includes ultrasound-induced long-period fiber grating: including fixed bracket, zigzag metal plate, piezoelectric ceramics, RF power supply and adjustment screws; The sawtooth surface of the plate, and the length direction of the double-clad doped fiber is consistent with the length of the sawtooth period on the sawtooth surface; adjust the height of the sawtooth metal plate by rotating the adjustment screw, so that the sawtooth surface will hold the double-clad doped fiber on top of the fixed On the lower surface of the top plate of the support, the piezoelectric ceramics are connected to the radio frequency power supply. The invention has an all-fiber structure, no insertion loss, can realize both continuous and pulsed operation at the same time, and has the advantages of good beam quality, high output power, compact structure, and stable and reliable performance.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a fiber laser, in particular to an ultrasonic-induced long-period fiber grating Q-switched pulse and continuous dual-purpose fiber laser. Background technique [0002] In the current field of laser technology, fiber lasers are developing rapidly due to their small size, high efficiency, good stability, and good beam quality. Existing Q-switched fiber lasers are the same as ordinary Q-switched lasers. A Q-switched device is inserted in the laser resonator, and the Q-switched laser pulse output is realized by periodically changing the cavity loss. [0003] Currently commonly used Q-switching technologies include acousto-optic Q-switching, electro-optic Q-switching, saturable absorber Q-switching, fiber-optic Michelson interferometer Q-switching, fiber-optic Mach-Zenter interferometer Q-switching, and fiber-optic stimulated Brillouin scattering ( SBS) Q modulation, activ...

AI Technical Summary

Problems solved by technology

However, no matter what kind of Q-switching device is inserted, a certain insertion loss will be introduced, which will affect the peak power. Especially the most widely used acousto-optic Q-switching and electro-optic Q-switching will have a large insertion loss due to the insertion of discrete components. , even the commonly used fiber-optic Q-switching devices with pigtails still have large insertion loss

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