A short straight cavity single polarization single longitudinal mode fiber laser and its preparation method
A fiber laser, single-polarization technology, used in lasers, laser parts, phonon exciters, etc., can solve the problems of weak birefringence characteristics of fiber Bragg gratings and difficult fiber lasers
Active Publication Date: 2021-01-19
XI AN JIAOTONG UNIV
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Problems solved by technology
However, due to the weak birefringence characteristics of the fiber Bragg gratings written by the femtosecond laser phase mask method, the wavelength difference of the Bragg reflection peaks corresponding to the two orthogonal polarizations is very small, and it is difficult to achieve single-layer polarization on non-PM fibers by wavelength selective matching. polarized fiber laser
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[0045] In order to make the purpose, technical effects and technical solutions of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments It is a part of the embodiment of the present invention. Based on the disclosed embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall all fall within the protection scope of the present invention.
[0046] see figure 1 , figure 1 It is a structural schematic diagram of a fiber laser made by the present invention, which consists of an active fiber 3, a first fiber Bragg grating 4 on the active fiber 3, a second fiber Bragg grating 5, a wavelength division multiplexer 6, and a laser pump source 1 , an optical isolator 7 an...
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Abstract
The invention discloses a short straight cavity single-polarization single-longitudinal-mode fiber laser and a preparation method thereof. A first fiber Bragg grating and a second fiber Bragg gratingare inscribed on an active fiber, the first fiber Bragg grating is used for forming a high-reflectivity cavity mirror, and the second fiber Bragg grating is used for forming an output cavity mirror. One end, inscribed with the second fiber Bragg grating, of the active fiber is connected with a common end of a wavelength division multiplexer. The slow (fast) axis of the first fiber Bragg grating and the fast (slow) axis of the second fiber Bragg grating are parallel and correspond to the same polarization mode. The Bragg reflection peak wavelength corresponding to the slow axis of the first fiber Bragg grating is equal to the Bragg reflection peak wavelength corresponding to the fast axis of the second fiber Bragg grating, and the polarization is separated from the Bragg wavelength reflection peak in the orthogonal direction. According to the invention, the short straight cavity single-polarization single-longitudinal-mode fiber laser can be directly manufactured on the active fiber byusing a femtosecond laser phase mask method.
Description
technical field [0001] The invention belongs to the technical field of fiber optics and fiber lasers, in particular to a short straight cavity single polarization single longitudinal mode fiber laser and a preparation method thereof. Background technique [0002] Single longitudinal mode fiber laser has the advantages of good stability, good beam quality, low threshold, high efficiency, etc., and has a wide range of applications in the fields of fiber optic sensing, fiber optic communication, and laser ranging. Among various single longitudinal mode fiber laser solutions, fiber lasers using ultra-short line cavity (ultra-short straight cavity) have the advantages of small size and high integration. In order to obtain a single longitudinal mode output, the cavity length must be as short as possible. In addition to narrow linewidth, many applications such as nonlinear frequency mixing and coherent beam combining also require lasers to be single-polarized. [0003] Usually sh...
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IPC IPC(8): H01S3/067
CPCH01S3/06708H01S3/0675
Inventor 陈涛司金海范春松齐彩静侯洵
Owner XI AN JIAOTONG UNIV