Annular chamber broadband random fiber laser

Abstract

The invention discloses an annular chamber broadband random fiber laser. The annular chamber broadband random fiber laser includes: a pump light source (1), a wavelength division multiplexer WDM (3), a standard single-mode fiber (7) and a beam splitter (5), wherein a first port (2) of the wavelength division multiplexer WDM (3) is connected with the pump light source (1), a second port (4) and a public port (8) of the wavelength division multiplexer WDM (3) are connected with two ends of the standard single-mode fiber (7) respectively to form a closed loop which is an annular resonant chamber, and the beam splitter (5) is connected between the second port (4) of the wavelength division multiplexer WDM (3) and the standard single-mode fiber (7) as a random laser output port (6). The annular chamber broadband random fiber laser has advantages of low pumping threshold, adjustable coherence, wide frequency spectrum and stable output. The annular chamber broadband random fiber laser can be used as a novel broadband light source with simple structure, so as to be widely used in the fields of light sensing and light communication.

Description

technical field [0001] The invention relates to the field of novel fiber lasers, in particular to a ring cavity broadband random fiber laser. Background technique [0002] Random lasing is formed by the multiple scattering amplification of light waves in a random gain medium. When light waves are transmitted in the optical fiber, due to the inherent inhomogeneity of the dielectric material, distributed Rayleigh scattering will occur in the optical fiber, that is, random optical feedback will be formed in space. The weak scattered light accumulates as the transmission distance increases, and is continuously amplified by the Raman scattering effect. When the gain is large enough to offset the loss of the fiber, the emitted laser light can be formed. The randomly distributed feedback fiber laser based on this principle has the advantages of continuous and stable output, long transmission distance and broadband wavelength tunability, and has broad application prospects in the f...

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Problems solved by technology

[0003] In view of the above prior art, the technical problem to be solved by the present invention is to provide a ring cavity random fiber laser, which can overcome the low efficiency of the traditional Rayleigh scattering effect, and only the back Rayleigh scattering part can be used as optical feedback. Higher threshold pump power, and the generated first-order random laser are easy to cause second-order Raman effect, thereby reducing the shortcomings of the output power and bandwidth of the first-order Raman laser, the present invention is simple in structure and easy to implement

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