A Random Laser Based on Fresnel Reflection of Optical Fiber Flat End Face

Abstract

The invention discloses a random laser based on the Fresnel reflection of a flat end face of an optical fiber, and relates to the field of high-power fiber lasers. The laser includes a pump light source, a wavelength division multiplexer, a band-stop filter and a single-mode fiber; the wavelength division multiplexer has two input ports and one output port; the pump light of the pump source passes through one of the input ports The input wavelength division multiplexer, the other input port only allows the first-order Stokes light to pass through, and is connected to a fiber with a flat end face to reflect the first-order Stokes lasing from the pump light in the fiber. Light; the output end of the wavelength division multiplexer is connected to the input end of the band-rejection filter through an optical fiber, and the output end of the band-rejection filter is connected to a segment of single-mode fiber, and the end of this segment of single-mode light is an inclined end face, which is the output end of the laser . Therefore, the maximum output power of the first-order random laser is further increased, and a high-power first-order random laser output with an optical-to-optical conversion efficiency greater than 80% is obtained.

Description

technical field [0001] This technology relates to the field of high-power fiber lasers. Its technical advantages lie in its simple structure, without the need for fiber gratings or fiber ring mirrors, it can generate high-power fiber random laser output, and its light-to-light conversion efficiency is >80%. The random laser with this structure is based on The Raman effect in the fiber, the output laser can choose a wide range of wavelengths, and the first-order random laser corresponding to the wavelength can be obtained by selecting the pump wavelength. Background technique [0002] Compared with traditional solid-state lasers, fiber lasers have the advantages of small size, high beam quality, and convenient thermal management. At present, the output laser power of high-power rare-earth ion-doped fiber lasers mainly doped with ytterbium has advanced by leaps and bounds. As another important way to obtain fiber laser, the Raman effect in optical fiber has a wider gain ba...

AI Technical Summary

Problems solved by technology

However, the output characteristics of ordinary fiber random lasers with fully open-cavity structures are easily affected by the parasitic feedback at the output end of the fiber. Theoretical simulations show that 10 -5 The magnitude of the end-face parasitic feedback will significantly change the power distribution of the laser, reduce the laser output efficiency and the lasing threshold of the high-order laser, thus limiting the power to generate high-power first-order random laser in practical experiments

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