4-8[mu]m-pulse Raman all-fiber laser

Abstract

The invention discloses a 4-8[mu]m-pulse Raman all-fiber laser, and belongs to the field of the laser. The 4-8[mu]m-pulse Raman all-fiber laser comprises a light source, a gain fiber I and a gain fiber II that are connected in sequence, wherein a first resonant cavity and a second resonant cavity are formed in the gain fiber I; a multi-order stokes optical resonant cavity is formed in the gain fiber II; the first resonant cavity and the second resonant cavity are partially overlapped; and a pulse switch is arranged in a place, which is not overlapped with the first resonant cavity, in the second resonant cavity. According to the 4-8[mu]m-pulse Raman all-fiber laser provided by the invention, the 4[mu]m intermediate infrared Q-switched pulse and Raman Q-switched pulse laser with wavelength of greater than 4[mu]m can be efficiently realized under the normal temperature, so that the laser threshold value can be greatly lowered, the output efficiency can be improved, and the cost loss is relatively low; and in addition, the Raman all-fiber laser has the characteristics of easy integration, facilitated practical application, and capability of realizing 3.9[mu]m laser efficient output under a non-cooling room temperature condition.

Description

technical field [0001] The invention relates to a laser, in particular to a 4-8 μm pulsed Raman all-fiber laser. Background technique [0002] Lasers in the mid-infrared band are favored by many researchers because of their wide application in atmospheric communications, industry, national defense, medical treatment, chemistry and other fields. Compared with traditional solid-state and gas lasers, fiber lasers have low threshold, good beam quality, and high conversion efficiency; at the same time, the optical fiber used as a gain medium has the characteristics of good flexibility and easy integration, and its high surface area-to-volume ratio is good for heat dissipation . Mid-infrared Q-switched pulsed lasers have irreplaceable important applications in industrial processing, laser minimally invasive surgery, nonlinear wavelength conversion, and laser countermeasures. Therefore, the development of mid-infrared pulsed fiber lasers has important scientific significance and a...

AI Technical Summary

Problems solved by technology

In recent years, in the mid-infrared band, the research team of the University of Laval in Canada has been more active in the research of mid-infrared Raman fiber lasers. In recent reports, the longest wavelength (3.77 μm) they obtained was obtained by using 3 μm The band Er-doped fluoride ZBLAN fiber is used as the pump source, and the passive sulfide fiber is used as the nonlinear medium. Although the continuous Raman laser output is obtained, the output power and slope efficiency are low.

Domestic research in this area is relatively lagging behind, and is still limited to the simulation stage

Images