A saturable absorption mirror based on highly nonlinear twin-core optical fiber

Abstract

The invention provides a saturable absorption mirror based on a highly nonlinear twin-core optical fiber. The saturable absorption mirror includes a single-mode optical fiber, high nonlinear twin-coreoptical fiber and mirror; Single-mode optical fiber comprises a core (A1) of a single-mode optical fiber and a cladding (A2) wrapped around the core of the single-mode optical fiber; The highly nonlinear twin-core optical fiber comprises two cores (B1) of the nonlinear twin-core optical fiber, a core (B2) and a cladding (B3) wrapped around the two cores; The optical signal is injected into the fiber core (B1) through a single-mode fiber coupling. The optical signal is reflected by a mirror at the other end of the highly nonlinear twin-core fiber, propagates backward along the direction of theincident fiber core and is outputted from the single-mode fiber. The invention increases the nonlinear phase shift of the optical signal in the cavity by adopting the highly nonlinear twin-core optical fiber, reduces the volume to enhance the compactness of the structure, and adjusts the saturation power by the fiber core distance of the adjustable nonlinear twin-core optical fiber, so as to increase the working stability of the laser under the condition of higher power damage threshold.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a saturable absorbing mirror based on a highly nonlinear double-core optical fiber. Background technique [0002] Ultrashort pulse fiber laser sources have important research and application values ​​in the fields of industry, medical treatment and nonlinear optical research. As the core device of passively mode-locked fiber lasers, saturable absorbers play a key role in improving the performance of lasers. [0003] At present, saturable absorbers are mainly divided into two categories: based on the artificial synthesis of optical fiber devices, such as nonlinear polarization rotation saturable absorbers, or nonlinear fiber loop mirror saturable absorbers; based on the physical properties of materials, such as carbon-based Saturable absorption properties of nanotubes or graphene. [0004] The disadvantages of the above two existing saturable absorbers are: the artificially synth...

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Problems solved by technology

[0004] The disadvantages of the above two existing saturable absorbers are: the artificially synthesized saturable absorbers based on optical fiber devices have a high power damage threshold, but require long-distance optical fibers to increase the nonlinear phase of the optical signal in the cavity. However, the increase of the cavity length will lead to the problem that the stability of the laser is easily affected by the environment; the saturable absorber based on the physical properties of the material has a smaller volume than the saturable absorber based on the artificial synthesis of optical fiber devices. advantage, but the power damage threshold of the material is lower

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