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A laser and all-fiber technology, which is applied in the field of linear cavity active Q-switched all-fiber lasers, can solve problems such as the difficulty of realizing full-fiber fiber lasers, large insertion loss, etc., and achieve the effects of low cost, simplified structure, and easy industrialization
Inactive Publication Date: 2013-01-02
HFB PHOTONICS CO LTD
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The acousto-optic Q switch is widely used in solid-state lasers, but as a switching device, it will cause a large insertion loss in fiber lasers, and it is difficult to realize all-fiber fiber lasers
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[0013] The present invention will be further described below in conjunction with the accompanying drawings.
[0014] As shown in the figure, a linear cavity active Q-switched all-fiber laser includes a pump semiconductor laser 1, a fiber combiner (combiner or WDM) 2, a high-reflectivity fiber Bragg grating 3, a gain fiber 4, and a piezoelectric element ( piezoelectric element) 5, piezoelectric element modulation signal drive circuit 6, low reflectivity fiber Bragg grating 7, fiber optic isolator 8 and output fiber 9, the structure of the above-mentioned components is the same as the prior art, and will not be described here, such as the gain fiber 2 It can be single-clad fiber or double-clad fiber, any rare earth doped fiber (Yb, Er, Tm, Ho, Nd, etc.), or a variety of rare earth co-doped fibers (Er / Yb , Tm / Ho, etc.). The length of the gain fiber is not limited like the single-frequency fiber laser, and a relatively long gain fiber can be used to obtain a relatively high outpu...
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Abstract
The invention discloses a linear-cavity active Q-switching all-fiber laser. The laser is characterized in that a linear cavity is provided, the output tail of a pumping semiconductor laser is connected with the pumping input port of a fiber beam combiner; the fiber output port of the fiber beam combiner is connected with a high-reflectivity fiber bragg grating; the other terminal of the high-reflectivity fiber bragg grating is welded with gain fibers together; the other terminal of the gain fibers is welded with a low-reflectivity fiber bragg grating formed on polarization-preserving fiber; an adjustable piezoelectric element signal drive circuit is used for driving a piezoelectric element to press fiber in the cavity periodically to modulate the polarization direction of light; the other terminal of the low-reflectivity fiber bragg grating is connected with the input terminal of a fiber isolator; and the output fiber is connected with the output terminal of the fiber isolator. The laser provided by the invention has the advantages of little insertion loss, simplified structure, high repeating frequency of laser pulses, low cost and easiness in industrialization. Large-diameter core double-cladding gain fibers can be used in the laser cavity, so that high-energy high-power laser pulses can be obtained conveniently.
Description
technical field [0001] The invention relates to a fiber laser, in particular to a compact linear cavity active Q-switched all-fiber laser. Background technique [0002] As we all know, a fiber laser is a laser with a fiber doped with rare earth elements as the gain medium. By doping different rare earth elements, such as erbium (Er), 镒 (Yb), thulium (Tm), holmium (Ho), neodymium (Nd) ), etc., the working band of fiber laser covers from ultraviolet to mid-infrared. Compared with other lasers, fiber lasers have distinctive features such as low laser working threshold, high energy conversion rate, good output beam quality, compact and stable structure, no need for optical path adjustment, good heat dissipation performance, long service life and no maintenance, etc., so it has been developed rapidly. and widely applied. At present, the output power of continuous output fiber laser has reached 10,000 watts, and has been widely used in material processing, welding, marking and o...
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