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All-fiber axisymmetric polarized beam laser based on less-mode fiber bragg grating and generating method thereof

An axisymmetric polarization and beam laser technology, applied in the field of lasers, can solve the problems of portability discount, high input laser power requirements, and poor laser output stability, etc., to achieve easy movement and productization, high polarization purity, The effect of structural stability

Inactive Publication Date: 2012-07-04
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the axisymmetrically polarized lasers reported so far are spatially structured lasers, and individual axisymmetrically polarized lasers with all-fiber structures do not avoid the spatial coupling process, so portability is greatly reduced; and these lasers are suitable for exciting axisymmetrically polarized beams. The input laser power requirements of these lasers are very high; in addition, due to the introduction of spatial structure, the output stability of these lasers is not very good

Method used

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  • All-fiber axisymmetric polarized beam laser based on less-mode fiber bragg grating and generating method thereof
  • All-fiber axisymmetric polarized beam laser based on less-mode fiber bragg grating and generating method thereof
  • All-fiber axisymmetric polarized beam laser based on less-mode fiber bragg grating and generating method thereof

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Embodiment 1

[0040] Such as figure 1 As shown, the semiconductor pump source 11 is connected to the wavelength division multiplexer 12, and through the wavelength division multiplexer 12, pump energy is injected into the rare earth doped optical fiber 14 connected to the common end of the wavelength division multiplexer, so as to stimulate the gain The medium provides resonance energy to the entire laser;

[0041] The single-mode fiber grating 13 is connected with the other end of the wavelength division multiplexer 12, and is used to control the resonance wavelength of the axisymmetrically polarized beam laser, and the reflection wavelength of the single-mode fiber grating is the same as the fundamental mode reflection wavelength of the few-mode fiber grating to ensure The resonant wavelength of the laser is the same as the reflection wavelength of the fundamental mode of the few-mode fiber grating. The few-mode fiber refers to an optical fiber with a normalized frequency between 2.405 ...

Embodiment 2

[0043] Embodiment 2: The basic theory of embodiment 2 is the same as that of embodiment 1, except that the wavelength selection component is changed. Such as figure 2 As shown, the wavelength selection component in Embodiment 2 of the present invention adopts a combination of a broadband reflective element 28 and a bandpass filter 23 . Wherein the broadband reflective element 28 can use the optical fiber reflection ring mirror, the coated reflector etc., the transmission wavelength of the band-pass filter is identical with the fundamental mode reflection wavelength of the few-mode fiber grating 17, to ensure that the laser resonant peak and the fundamental mode of the few-mode fiber grating The reflection peaks are consistent. The few-mode fiber grating is the same as described in Embodiment 1.

[0044] The pump source 11 is connected to the wavelength division multiplexer 12, and through the wavelength division multiplexer 12, injects pump energy into the rare earth-doped ...

Embodiment 3

[0046] Embodiment 3: as image 3 As shown, in this implementation, two identical few-mode fiber gratings 17 and 27 are used as laser cavity mirrors, wherein the few-mode fiber grating 27 can also be replaced by other reflective elements, such as broadband reflectors, and the few-mode fiber The grating is the same as described in Example 1.

[0047] The pump source 11 is connected to the wavelength division multiplexer 12, and the two ends of the few-mode fiber grating 27 are respectively connected to the common end of the wavelength division multiplexer 12 and the few-mode rare-earth-doped optical fiber 24 that supports high-order mode operation, and through wavelength division multiplexing The device 12 injects pump energy into the few-mode rare earth-doped optical fiber 24 connected to the common end of the wavelength division multiplexer 12 . The few-mode rare-earth-doped optical fiber refers to a rare-earth-doped optical fiber in which the optical fiber satisfies the oper...

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Abstract

The invention relates to an all-fiber axisymmetric polarized beam laser based on a less-mode fiber bragg grating and a method for generating an axisymmetric polarized laser beam. The characteristic of the less-mode fiber bragg grating that wavelength and transverse mode are in one-to-one correspondence is utilized, and a wavelength selection device is combined in a fiber resonant cavity, so that axial polarized beam laser output is realized. The laser mainly comprises a pumping source, a gain medium, the wavelength selection device and a mode selector unit containing the less-mode fiber bragggrating. The output has the characteristics of high polarization purity, single wavelength, narrow linewidth, convenience in realizing controlled switchover between radial polarization laser and poloidal polarization laser, and the like. The invention provides the truly all-fiber axisymmetric polarized beam laser with the advantages of more stable structure and convenience in movement and productization without adopting any special coupled devices.

Description

technical field [0001] The invention relates to the field of lasers, in particular to an all-fiber structure axisymmetric polarized beam laser with a few-mode fiber grating and a method for generating a polarized laser beam. Background technique [0002] Axisymmetric polarization state is a special polarization state different from ordinary polarization characteristics. Its polarization state is distributed symmetrically around the center of the beam. Generally, there are two types: radial polarization (such as Figure 5 shown) and angular polarization (as Figure 6 shown). The energy distribution of the axisymmetrically polarized beam is also different from that of the general laser beam. Its energy distribution is ring-shaped, and the center of the beam is the zero point of the energy distribution. [0003] The special polarization distribution characteristics of axisymmetrically polarized beams make it have special advantages in many fields, especially radially polarized...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/10
Inventor 孙彪许立新王安廷顾春明海
Owner UNIV OF SCI & TECH OF CHINA
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