Linear-cavity single-column vector mode output pulse fiber laser

Abstract

The invention discloses a linear-cavity single-column vector mode output pulse fiber laser. The laser comprises a pumping source (1), a wavelength division multiplexer (2), an input grating (3), a gain fiber (4), an optical fiber mode filter (5), a saturable absorber (6) based on the annular core optical fiber, and an output end (7), which are sequentially connected. An optical fiber used by the laser is the annular core optical fiber, has high refractive index difference, reduces the degeneracy between LP11 modes, effectively reduces the mutual coupling between vector modes in the LP11, enables the TE01 mode to stably exist in a laser cavity, and achieves the stable single-column vector mode pulse laser output by adding the saturable absorber into the cavity. The invention provides a method for generating stable single-column vector mode pulse laser for the first time, which is beneficial to the application of the column vector pulse fiber laser. The method can be applied to the fields of laser processing, microscopic imaging, optical storage and the like.

Description

technical field [0001] The invention relates to the technical field of pulsed fiber lasers, and specifically discloses a linear cavity single column vector mode output pulsed fiber laser. Background technique [0002] Due to its special mode field distribution and polarization characteristics, cylindrical vector beams are widely used in the fields of optical tweezers, particle acceleration, microscopic imaging and laser processing. In terms of laser processing, radially polarized light has a stronger longitudinal electric field component than traditional circularly polarized beams after focusing, and its metal cutting efficiency can be increased by more than 2 times, and the cutting surface has a larger depth ratio, which improves the cutting efficiency. quality and efficiency. In terms of microscopic imaging, optical probes based on columnar vector beams can achieve atomic-level resolution, greatly improving the resolving power. The pulsed laser can better meet the requir...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the defects of poor stability and low practicability of existing cylindrical vector pulsed fiber lasers. Based on the self-designed and manufactured high refractive index difference annular core fiber and fiber mode filter, a linear cavity with a single Column vector mode output pulsed fiber laser

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