Dual-wavelength mode-locked fiber laser with wavelength interval exceeding 50 nanometers and dual-wavelength mode-locked laser output generation method

Abstract

The invention discloses a dual-wavelength mode-locked fiber laser with a wavelength interval exceeding 50 nanometers. The dual-wavelength mode-locked fiber laser comprises a table type amplification laser pumping source, a wavelength division multiplexer, a polarization controller I, a thulium-holmium co-doped gain fiber, an optical fiber coupler, a polarization independent isolator and a nonlinear polarization rotary artificial saturable absorber. The table type amplification laser pumping source, the wavelength division multiplexer, the polarization controller I, the thulium-holmium co-dopedgain fiber, the optical fiber coupler, the polarization independent isolator and the nonlinear polarization rotation artificial saturable absorber are sequentially connected to form an optical fiberannular cavity. The mode-locked laser is realized by using the nonlinear polarization rotation artificial saturable absorber, intracavity birefringence is effectively changed by adjusting the intracavity polarization controller I and the intracavity polarization controller II so that a bandwidth of the intracavity artificial birefringence filter is controlled, and meanwhile, by combining the intracavity gain competition, dual-wavelength mode-locked pulse output with ultra-wide spectral intervals is realized.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a dual-wavelength mode-locked fiber laser with a wavelength interval exceeding 50 nanometers and a method for generating dual-wavelength mode-locked laser output. Background technique [0002] A multi-wavelength fiber laser is a laser with compact structure, good beam quality, low insertion loss, and capable of multi-wavelength laser output. Single-mode fiber usually has weak birefringence, and the artificial birefringence filter made by using the birefringence in the fiber or some fiber optic devices will cause the laser to output multi-wavelength laser light. Early studies have shown that cooling to 77K in liquid nitrogen can reduce the uniform broadening linewidth of erbium-doped fiber, thereby obtaining multi-wavelength laser output. Some subsequent studies also found that with the different birefringence in the cavity, the laser can output multi-wavelength lasers with differ...

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Problems solved by technology

[0005] Purpose of the invention: Aiming at the problem that there is no dual-wavelength mode-locked fiber laser with a 2μm ultra-wide spectral interval, the present invention proposes a dual-wavelength mode-locked fiber laser with a wavelength interval of more than 50 nanometers and a method for generating dual-wavelength mode-locked laser output

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