Compact type mid-infrared band four-wavelength same-repetition-frequency all-fiber laser

Abstract

The invention discloses a compact type mid-infrared band four-wavelength same-repetition-frequency all-fiber laser, and belongs to the technical field of fiber lasers. The laser comprises a laser pumping source, a first sulfide fiber, a rare earth ion doped fiber and a second sulfide fiber which are connected in sequence. Multiple pairs of fiber bragg gratings in one-to-one correspondence are engraved on the first sulfide fiber and the second sulfide fiber to form multiple resonant cavities, and the resonant cavities are used for selecting the lasers with different wavelengths; and the first sulfide fiber or the second sulfide fiber is subjected to tapering treatment and coated with a two-dimensional material for generating a pulse laser. The middle-infrared band multi-wavelength same-repetition-frequency pulse laser can be generated only through one laser based on a single gain fiber, the same repetition frequency can be accurately controlled, meanwhile, the system structure is greatly simplified, and the situation that multiple independent rare earth ion doped fiber lasers need to be constructed respectively in a traditional scheme, and a complex system in which the output laser is combined is performed is avoided.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, in particular to a compact all-fiber laser with four wavelengths and the same repetition frequency in the mid-infrared band. Background technique [0002] The 3-5.5μm band laser is just in the absorption window of the atmosphere, the concentration area of ​​thermal radiation energy, and the strong absorption area of ​​water. It has military and civilian applications in spectrum detection, laser medical treatment, material processing, environmental monitoring, atmospheric communication, and infrared directional confrontation. important application. At present, the generation of mid-infrared pulsed fiber laser is mainly achieved by using rare earth ion-doped fiber as the gain medium, using active or passive (saturated absorber or nonlinear effect, etc.) Most of them are single-wavelength, and there is still a lack of mature technical solutions to realize pulsed (especially multi-wavelength an...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem in the prior art that a single laser cannot be configured based on a single gain fiber to realize multi-wavelength pulsed laser output, and to provide a compact all-fiber laser with four wavelengths and the same repetition frequency in the mid-infrared band

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