Intermediate infrared multi-band all-fiber soft glass laser and laser obtaining method

Abstract

The invention provides an intermediate infrared multi-band all-fiber soft glass laser and a method for obtaining intermediate infrared multi-band fiber laser through the laser. The laser comprises a laser pumping source, laser pumping source tail fibers, a first fiber fusing point, a first fiber bragg grating, a second fiber bragg grating, first rare earth ion doped fibers, a third fiber bragg grating, a fourth fiber bragg grating, a second fiber fusing point, a fifth fiber bragg grating, a sixth fiber bragg grating, a seventh fiber bragg grating, an eighth fiber bragg grating, second rare earth ion doped fibers, an ninth fiber bragg grating, a tenth fiber bragg grating, an eleventh fiber bragg grating and a twelfth fiber bragg grating which are connected in sequence. According to the laser, a dual-band cascaded Ho<3+>-doped fluoride fiber laser pumped by a semiconductor laser is used as the pumping source; Pr<3+> and Tb<3+> co-doped sulfide fiber with annular composite core structures are used as gain medium; and a sulfide fiber bragg grating array is used as resonant cavity feedback and output coupling, so that simultaneous output of four-waveband fiber laser of 3.7[mu]m, 4.89[mu]m, 5.1[mu]m and 7.5[mu]m under the all-fiber structure can be realized.

Description

technical field [0001] The invention belongs to the technical field of lasers, in particular to a mid-infrared multi-band all-fiber soft glass laser and a method for obtaining mid-infrared multi-band fiber laser using the laser. Background technique [0002] The 2-20 μm mid-infrared band not only includes two important atmospheric transmission windows (3-5 μm and 8-12 μm), but also covers the absorption peaks of many important molecules, atoms, and chemical bonds. Therefore, mid-infrared laser sources with wavelengths in this range It has important application prospects in the fields of biomedicine, material processing, atmospheric communication, gas detection, and infrared countermeasures. As a new type of laser, fiber laser has a series of advantages such as high conversion efficiency, good heat dissipation, good beam quality, and easy integration compared with traditional lasers such as solid-state lasers, gas lasers, and semiconductor lasers. Therefore, the development o...

AI Technical Summary

Problems solved by technology

However, in the mid-infrared region with longer wavelengths, it is currently difficult to achieve fiber laser output due to limited energy level radiation transition capabilities. In addition, in the mid-infrared region with wavelengths greater than 3 μm, simultaneous output of multiple band fiber lasers has not yet been achieved. effective solution, and the realization of the above-mentioned fiber laser can further expand the application of mid-infrared fiber laser in practice

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