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

Abstract

The invention discloses a dual-wavelength mode-locked fiber laser with a wavelength interval of more than 50 nanometers. The dual-wavelength mode-locked fiber laser includes a desktop amplified laser pump source, a wavelength division multiplexer, a polarization controller I, and a thulium-holmium co-doped gain Optical fiber, fiber coupler, polarization-independent isolator and nonlinear polarization rotation artificial saturable absorber, bench-top amplified laser pump source, wavelength division multiplexer, polarization controller I, thulium-holmium co-doped gain fiber, fiber coupler, A polarization-independent isolator and a nonlinear polarization-rotating artificial saturable absorber are sequentially connected to form a fiber ring cavity. The invention realizes the mode-locked laser by using the artificial saturable absorber of nonlinear polarization rotation, and effectively changes the birefringence in the cavity by adjusting the polarization controller I and the polarization controller II in the cavity, thereby controlling the artificial birefringence filter in the cavity Combined with the gain competition in the cavity, the dual-wavelength mode-locked pulse output with ultra-wide spectral interval 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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