A broadband wavelength tunable mid-infrared Raman fiber laser

Abstract

A broadband wavelength tunable mid-infrared Raman fiber laser includes a tunable fiber laser unit, a fiber amplifier unit, a collimating coupling unit and a Raman laser resonator unit, the Raman laserresonator unit includes a grating, the tunable fiber laser unit outputs laser light of a preset first band to the fiber amplifier unit, and after the laser light of the first wave band passes throughthe optical fiber amplifier unit to amplify the optical power, the laser light is input tothe collimating coupling unit; the collimating coupling unit couples the laser light after the optical poweramplification to the Raman laser resonator unit. The Raman laser resonator unit outputs the Raman laser light with the preset second wavelength band by adjusting the tilt angle of the grating based onthe laser light after the optical power amplification. As a grating exists in the Raman laser resonator unit, the wavelength of the Raman laser output can be adjusted by adjusting the tilt angle ofthe grating, so that the application field of the laser can be greatly expanded.

Description

technical field The invention relates to the field of Raman fiber lasers, in particular to a broadband wavelength tunable mid-infrared Raman fiber laser. Background technique Due to the advantages of small size, high efficiency, simple structure, and easy maintenance, fiber lasers have been widely used in military and civilian fields. Fiber laser can be generally divided into two categories according to its working medium: one is to use rare earth doped fiber (such as one or more of erbium-doped fiber, ytterbium-doped fiber, thulium-doped fiber, holmium-doped fiber) as its gain medium , to generate laser oscillation, and the other uses nonlinear effects in the fiber (such as stimulated Raman scattering, stimulated Brillouin scattering) to generate laser output. Optical fibers based on rare earth doping cannot achieve lasers in the 1.1-1.25 micron, 1.6-1.75 micron, and 2.1-2.3 micron bands due to the fixed emission cross-section of rare earth ions. The fiber Raman laser is...

AI Technical Summary

Problems solved by technology

The main purpose of the present invention is to provide a broadband wavelength tunable mid-infrared Raman fiber laser, which can solve the technical problem of single wavelength of mid-infrared Raman fiber laser

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