Random laser based on Fresnel reflection of fiber flat surface

Abstract

The invention discloses a random laser based on Fresnel reflection of fiber flat surface and relates to the field of a high-power fiber laser. The laser comprises a pump light source, a wavelength division multiplexer, a band elimination filter and a single-mode fiber; the wavelength division multiplexer is provided with two input ports and one output port; the pump light of the pump light source is input to the wavelength division multiplexer via one input port and the other input port only allows the passing of first-order Stokes light, is connected to a fiber with a flat surface at the tail end and reflects the first-order Stokes light of the pump light from the inside of the fiber by stimulated emission; the output end of the wavelength division multiplexer is connected with the input end of the band elimination filter via the fiber; the output end of the band elimination filter is connected with one section of the single-mode fiber; the tail end of the single-mode fiber is an inclined surface and is used as the output end of the laser. The maximum output power of the first-order random laser is further increased and the output of the high-power and first-order random laser with light conversion rate of greater than 80% is obtained.

Description

Technical field [0001] This technology relates to the field of high-power fiber lasers. Its technical advantage lies in its simple structure, does not require fiber gratings or fiber ring mirrors, can generate high-power fiber random laser output, and has optical-to-light conversion efficiency> 80%, and the random laser of this structure is based on the Raman effect in the fiber, and the output laser has a wide range of selectable wavelengths. The first-order random laser of the corresponding 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 doped with ytterbium has increased by leaps and bounds. The Raman effect in the fiber is another important way to obtain fiber laser. Compared with the stimulated amplific...

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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