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Random fiber laser based on stimulated Raman effect

A fiber laser and stimulated Raman technology, which is applied to lasers, laser parts, and laser scattering effects, etc., can solve the problems of complex manufacturing process and difficult writing, and achieve the effect of reducing the threshold power.

Inactive Publication Date: 2015-07-08
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in order to obtain sufficient gain, this method needs to write a long fiber grating (tens of centimeters) on the rare earth element-doped optical fiber, which is complicated in the manufacturing process and difficult to write

Method used

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  • Random fiber laser based on stimulated Raman effect

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Embodiment

[0021] figure 1 It is a structural schematic diagram of a random fiber laser based on the stimulated Raman effect of the present invention. Wherein the first fiber grating 1 and the second fiber grating 7 are written by single-mode fiber, the length is 1 cm, the reflectivity is 99.9%, and the center wavelength is 1455 nm. The first random phase-shifting fiber grating 2 is written by a single-mode fiber with a reflectivity of 90%, a length of 5 cm, and a center wavelength of 1550 nm. The second random phase-shift fiber grating 6 is written by a single-mode fiber with a reflectivity of 99.9%, a length of 5 cm, and a center wavelength of 1550 nm. The laser wavelength of the Raman pumping laser source 3 is 1455nm, the working wavelength of the wavelength division multiplexer 4 is 1455nm / 1550nm, and the length of the single-mode optical fiber (5) is 20km. The first fiber grating 1 is connected to one end of the first random phase-shift fiber grating 2, the other end of the first ...

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Abstract

The invention discloses a random fiber laser based on stimulated Raman effect and belongs to the technical field of fiber lasers. The random fiber laser comprises a first fiber Bragg grating, a first random phase shifting fiber Bragg grating, a Raman pumping laser source, a wavelength division multiplexer, a single mode fiber, a second random phase shifting fiber Bragg grating and a second fiber Bragg grating. The common fiber Bragg gratings are used for reflecting pumping light, the random phase shifting fiber Bragg gratings provide random light feedback, and laser threshold power can be effectively lowered. The stimulated Raman effect is used for achieving light gain, Random pumping light wavelength and fiber Bragg grating center lengths can be changed, and random laser output with different wavelengths is obtained. The laser has the advantages of being simple in structure, easy to manufacture, low in threshold power and the like.

Description

technical field [0001] The invention relates to a random fiber laser, in particular to a random fiber laser based on a stimulated Raman effect, and belongs to the technical field of fiber lasers. Background technique [0002] Random fiber laser is a new type of fiber laser developed in recent years. It is different from traditional lasers in structure, that is, there is no mirror, and the light feedback is realized through random feedback in the fiber. Most random fiber lasers today are based on Rayleigh scattering in the fiber to achieve random distributed feedback. Due to the very weak Rayleigh scattering in the fiber, such random fiber lasers often require long-distance fibers (tens of kilometers) and high threshold power. In order to overcome the problem of weak Rayleigh scattering in random fiber lasers, it is proposed to write fiber gratings on rare earth doped fibers to provide random feedback, thereby shortening the distance of random feedback and lowering the thres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/30H01S3/094H01S3/10
Inventor 黄昌清范瑜徐凌峰刘梦诗韩佳晖
Owner CHINA JILIANG UNIV
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