Random fiber laser with tunable wavelength

Abstract

The invention discloses a random fiber laser system with tunable wavelength, belonging to the laser device field. According to the system, first pump source laser with tunable wavelength and a series of low energy seed source laser are injected into a fiber, through a series of Raman amplification effects, distributed Raman amplification light is generated in a transmission fiber, and distributedRayleigh backward diffusion light forms random laser after Raman amplification. A random laser in the invention can realize continuous tunable wavelength. In a selectable scheme, after first Raman amplification, residual energy of a first pump source or a first seed source is fed back to the fiber for reuse, and slope efficiency of a finally formed random laser is raised. The system can control aRaman gain and a shape of a Raman gain spectrum through additional seed light, reduce a threshold of the laser, and raise output power.

Description

technical field [0001] The invention relates to a system in which distributed Rayleigh scattering in an optical fiber is amplified by Raman to form laser light. In particular, it relates to the generation of tunable random fiber lasers by generating controllable distributed Raman gain. Compared with traditional fiber lasers, this system has no laser resonator and belongs to the field of new laser devices. Background technique [0002] In the literature Sergei K. Turitsyn, Sergey A. Babin, Atalla E. El-Taher, Paul Harper, Dmitriy V. Churkin, Sergey I. Kablukov, Juan Diego Ania-Castanon, Vassilis Karalekas and Evgenii V. Podivilov. Random distributed feedback A random fiber laser system is introduced in fiber laser.Nature Photon.2010, 4, 231-235. In this system, two beams of equal-power 1455nm pump light are coupled into the fiber from the midpoint of the fiber in opposite directions (the total length of the fiber is 83km. The photons transmitted in the fiber are coherently ...

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