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Optional Transverse Mode Output Laser and Laser Output Method Based on Bragg Gratings

A Bragg grating and laser technology used in the laser field

Active Publication Date: 2022-05-27
SICHUAN UNIV
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Problems solved by technology

However, most of the existing selectable transverse mode lasers directly oscillate and output a single high-order transverse mode, or only a small number of transverse modes can be selected for output
And, to the best of our knowledge, there is currently no solution that includes a flat-hat beam in the optional transverse mode

Method used

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  • Optional Transverse Mode Output Laser and Laser Output Method Based on Bragg Gratings
  • Optional Transverse Mode Output Laser and Laser Output Method Based on Bragg Gratings
  • Optional Transverse Mode Output Laser and Laser Output Method Based on Bragg Gratings

Examples

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Embodiment

[0035] This example presents an optional transverse mode output laser based on Bragg gratings, such as figure 1 As shown, it includes pump source 16 (in this example, the pump source is 976nm pump source), wavelength division multiplexer 1, gain medium 2 (in this example, the gain medium is ytterbium-doped fiber Yb-1200), polarization controller (this example Example polarization controller includes 2, marked as polarization controller 1 3 and polarization controller 2 4), effective transverse mode selection element, fiber Bragg grating 1 5, laser output end (laser output end includes collimator 2 in this example 8). In this example, the structure of the effective transverse mode selection element includes an asymmetric F-P cavity, a half-wave plate 11 and a polarization beam splitter prism 12; the half-wave plate 11 is used to change the phase of the beam; the polarization beam splitter prism 12 is used to change the beam direction, At the same time, it plays the role of cha...

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Abstract

The invention discloses an optional transverse mode output laser and a laser output method based on a Bragg grating. The laser includes a pump source, a wavelength division multiplexer, a gain medium, a polarization controller, an effective transverse mode selection element, a fiber Bragg grating, and a laser output port. The structure forming the effective transverse mode selection element includes an asymmetric F-P cavity The asymmetric F-P cavity is composed of a fiber Bragg grating two and a high-reflection cavity mirror; the light beam entering the asymmetric F-P cavity through the fiber Bragg grating two is reflected by a high-reflection cavity mirror; by changing or selecting the optical fiber The cavity length of the asymmetric F-P cavity formed by the second Bragg grating and the high-reflection cavity mirror controls the light beam of a specific wavelength to reflect from the asymmetric F-P cavity back to the resonator through the second fiber Bragg grating; the light beam is changed by the polarization controller The polarization state, and finally realize the output of the corresponding mode at the laser output end. By changing or selecting the cavity length and adjusting the laser polarization state, the output of various transverse modes including top-hat beam can be selected.

Description

technical field [0001] The invention relates to a wavelength-transverse mode effective selective output technology based on Bragg gratings, in particular to a Bragg grating-based selectable transverse mode output laser and a laser output method, which belong to the field of lasers. Background technique [0002] Fiber lasers play an important role in communication, remote sensing, medical and processing fields due to their compact structure, good output beam quality, high stability, and convenient thermal management. Different modes in the fiber have special characterization parameters such as amplitude, phase, polarization state, orbital angular momentum, and spatial coherence. This enables modes with different light field properties to have great potential for practical applications. For example, the vortex light field carrying orbital angular momentum has high research value in optical manipulation, super-resolution imaging, improving communication capacity, etc. The vect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/08H01S3/067
CPCH01S3/0804H01S3/0675
Inventor 汪莎王少乾李悦周寿桓
Owner SICHUAN UNIV
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