A 1μm Band Cylindrical Vector Fiber Laser Based on Mode Selective Coupler

Abstract

The invention discloses a 1 μm band cylindrical vector fiber laser based on a mode selective coupler, including a pump source, a wavelength division multiplexer, a gain fiber, a circulator, a single-mode cloth Bragg grating, a first polarization controller, and a second polarization A controller, a mode selection coupler and a collimator; the output end of the pump source is connected to the short-wavelength input end of the wavelength division multiplexer, and the output end of the wavelength division multiplexer is connected to port 1 of the circulator through a gain fiber, Port 2 of the circulator is connected to a single-mode Bragg grating, port 3 of the circulator is connected to the long wavelength of the first polarization controller, mode selective coupler and wavelength division multiplexer, and the second polarization controller and collimator are connected to the mode Select the few-mode fiber output of the coupler. The invention has the advantages of high slope efficiency of fiber laser, small insertion loss and high polarization purity of column vector laser.

Description

technical field [0001] The invention belongs to the field of fiber lasers, and in particular relates to a 1 μm band cylindrical vector fiber laser based on a mode selective coupler. Background technique [0002] Cylindrical vector lasers include radially polarized light and angularly polarized light. Because of their special symmetrical polarization and intensity characteristics, they are widely used in quantum physics, optical tweezers, fiber optic sensing, surface plasmon excitation, and fiber optic communications. In particular, radially polarized light has attracted more and more attention. [0003] Cylindrical vector lasers are mainly generated by free-space devices or all-fiber methods. The use of free-space devices is mainly through the precise adjustment of the polarization state of bulk free-space devices such as phase modulators, combined half-wave plates, birefringent crystals, and subwavelength gratings to obtain cylindrical vector lasers. However, the use of t...

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Problems solved by technology

[0005] The solution of the present invention is to overcome the disadvantages of the prior art, such as complex structure, large loss, low efficiency, and low mode purity, and to provide a new method for generating continuous columnar vector lasers in the 1 μm band, that is, based on mode selective coupling The 1μm band cylindrical vector fiber laser of the laser, all the components of the laser adopt the all-fiber coupling mode, the structure is compact, it is not disturbed by external factors, and can work continuously and stably, and the mode selective coupler used in the fiber laser is passed through a new type of wireless The method of pre-stretching fused taper has the advantages of small insertion loss and simple preparation.

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