Signal-pump beam combiner capable of keeping high beam quality

A high-beam and beam combiner technology, applied in the coupling of optical waveguides, lasers, laser components, etc., can solve the problem of no signal transition fiber, difficult to achieve super large mode field, signal-pump combiner output mode field diameter Small problems, to achieve the effect of maintaining beam quality, reducing insertion loss, and high coupling efficiency

Active Publication Date: 2018-11-20
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is based on the current signal-pump beam combiner output mode field diamet

Method used

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  • Signal-pump beam combiner capable of keeping high beam quality
  • Signal-pump beam combiner capable of keeping high beam quality
  • Signal-pump beam combiner capable of keeping high beam quality

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Embodiment Construction

[0024] figure 2 It is a schematic diagram of the taper structure of the components of the present invention. These components of the signal transition fiber 2 of the present invention, the low-refractive index glass tube 4, the fused fiber bundle, and the output optical fiber 5 all pass through the taper. Area, cutting point, this picture is specially drawn for illustration. Among them, 61 represents the initial shape of the part before tapering, and the diameter of the part is D 8 , 62, 63 are the cone areas formed during the tapering process, 62 is the input end cone area, 63 is the output end cone area, L 8 is the length of the taper region, 64 is the waist region formed by the taper process, L 9 is the waist length, D 9 is the diameter of the tapered waist area, 65 is the input end cutting point (i.e. the boundary position between the input end cone area and the waist area), and 66 is the output end cutting point (i.e. the boundary position between the waist area and t...

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Abstract

The invention discloses a signal-pump beam combiner capable of keeping high beam quality and aims at solving the problem that an existing signal-pump beam combiner is difficult to keep high beam quality while achieving extra-large mode field output. The signal-pump beam combiner comprises a signal fiber, a signal transition fiber, pump fibers, a low-refractive index glass tube and an output fiber,wherein the signal fiber is welded with the signal transition fiber; N pump fibers surround the periphery of the signal transition fiber and pass through a taper in the middle of the low-refractive index glass tube to form a molten fiber bundle; the molten fiber bundle is welded with the output fiber; and the output fiber also passes through the taper. The signal-pump beam combiner is capable ofreducing the through put loss of signal light and keeping high coupling efficiency of pump light, thereby keeping high beam quality when the signal light reaches the signal transition fiber (a relatively large mode field) from the signal fiber (a small mode field) and then reaches the output fiber (an extra-large mode field).

Description

Technical field: [0001] The invention relates to the technical field of fiber lasers, in particular to a signal-pump beam combiner maintaining high beam quality. technical background: [0002] Compared with traditional lasers, fiber lasers have the advantages of high conversion efficiency, good beam quality, convenient thermal management, and compact structure. application; as people's requirements for the output power of fiber lasers continue to increase, high power has become an important goal for the development of fiber lasers. At present, the power of fiber lasers has completed a huge transformation from milliwatts to 10,000 watts. Relevant studies have shown that current high-power fiber lasers are based on the MOPA (Master Oscillator Power-Amplifier, the power amplifier of the master oscillator) structure. With the increase of the amplifier power based on the MOPA structure, the researchers found that when the power of the fiber laser increases to To a certain extent...

Claims

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Application Information

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IPC IPC(8): H01S3/067G02B6/255G02B6/25G02B6/245
CPCG02B6/245G02B6/25G02B6/255H01S3/06783
Inventor 陈子伦谷炎然杨欢雷成敏王泽锋许晓军
Owner NAT UNIV OF DEFENSE TECH
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