Active lock phase multi-fiber laser without external phase-adjusting part and interference bundle method

A technology of fiber lasers and coherent beams, applied in lasers, laser devices, laser components, etc., can solve problems such as difficult to achieve high power, complex structure, and reduced efficiency, and achieve easy implementation, simple heat dissipation, and small environmental impact Effect

Inactive Publication Date: 2010-02-10
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more fiber bundles, the more couplers are needed, the greater the insertion loss introduced, which reduces the efficiency, and the couplers have a certain laser damage threshold, it is difficult to achieve high power, and the structure is complicated, so this bundle Method is not an option for coherent beam combining of ultra-high power fiber lasers

Method used

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  • Active lock phase multi-fiber laser without external phase-adjusting part and interference bundle method
  • Active lock phase multi-fiber laser without external phase-adjusting part and interference bundle method
  • Active lock phase multi-fiber laser without external phase-adjusting part and interference bundle method

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Embodiment 1

[0029] Realize the active phase-locked multi-fiber laser without external phase modulation device and its laser coherent beam combining method.

[0030] Option One:

[0031] Include the following steps:

[0032] Step 1: Use an active double-clad fiber to make a fiber laser, and write a grating at both ends of one of the fiber lasers at the same time as a resonant cavity.

[0033] Step 2: The length of the active fiber of the resonator is determined according to the fiber doping concentration, local loss and pump power.

[0034] Step 3: Cut multiple active optical fibers to the same length, and ensure that the gain of the resonant cavity formed by the active optical fibers with gratings written on both ends is the largest.

[0035] Step 4: Remove the coating and outer cladding at both ends of the active optical fiber to a certain length.

[0036] Step 5: Combine the active optical fibers with the coating and outer cladding removed, add a common outer cladding, and use an app...

Embodiment 2

[0053] The present invention does not involve a specific pumping method, and can use end pumping, side pumping, coupler pumping, etc., all of which are owned by the patent holder or the document reporter.

[0054] The doped fiber used in Embodiment 2 is an active doped fiber, and its active medium can be erbium-doped, or ytterbium-doped, or holmium-doped, or thulium-doped.

[0055] Such as figure 1 As shown, it is an active phase-locked multi-fiber laser for laser coherent beam combining with side pump coupling without external phase modulation devices. The specific implementation plan is as follows:

[0056] Step 1: Prepare 4 active double-clad pump fibers. The active fiber length is determined by doping concentration, pump power and fiber background loss.

[0057] Step 2: Write gratings of the same wavelength at one end of the four active double-clad fibers.

[0058] Step 3: Write a grating of the same wavelength at the other end of one (21) of the four active double-cla...

Embodiment 3

[0064] The present invention does not involve a specific pumping method, and can use end pumping, side pumping, coupler pumping, etc., all of which are owned by the patent holder or the document reporter.

[0065] The doped fiber used in Embodiment 3 is an active doped fiber, and its active medium can be erbium-doped, or ytterbium-doped, or holmium-doped, or thulium-doped, etc.

[0066] Such as figure 1 As shown, it is an active phase-locked multi-fiber laser for laser coherent beam combining with side pump coupling without external phase modulation device. The specific implementation plan is as follows:

[0067] Step 1: Prepare 4 active double-clad pump fibers. The active fiber length is determined by doping concentration, pump power and fiber background loss.

[0068] Step 2: Write a grating at one end of one of the four active double-clad optical fibers (21).

[0069] Step 3: Remove the 4mm coatings at both ends of the 4 optical fibers, and corrode the outer cladding of...

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Abstract

The present invention relates to an active phase locking multi-optical fiber laser with no external phase modulation device and a coherent beam combination method. Two ends of an active optical fiberare written into a grating; the optical fiber with the maximum gain is used as a main resonant cavity for manufacturing optical fiber lasers; a plurality of active optical fibers with similar length are taken for manufacturing optical fiber lasers. Coating and outer cladding layers at two end parts of the optical fiber of each optical fiber laser are removed, and then a common outer cladding layeris arranged on the place where the outer cladding layers are removed. By utilizing synergistic coupling, the rest active optical fiber lasers are phase-locked on the laser of the main resonant cavitywithout adding any external phase modulation device, which simplifies the complex feedback control system of the prior active phase locking optical fiber laser. According to needs, the number of theoptical fiber lasers can be arbitrarily increased or decreased, so as to increase or decrease beam combination power. In an uncoupling area, the placement of the optical fibers can be arbitrarily arranged. The beam combination method can arbitrarily combine needed optical fiber lasers, can adopt discrete or united pumps, and is easy in heat dissipation and low in requirements on active optical fibers. The active phase locking multi-optical fiber laser is characterized in little influence from environment, compact structure, easy implementation, etc.

Description

Technical field: [0001] The invention relates to an active phase-locked multi-fiber laser without an external phase-modulating device and a coherent beam combining method. It is a high-power double-clad fiber laser, especially an active phase-locked multi-fiber laser laser coherent beam combining method. Laser beam assembly and optoelectronic devices. Background technique: [0002] The field of rare earth-doped optical fiber is a new branch of current optics. The gain characteristics of rare earth ions combined with the advantages of optical fiber have developed many compact and high-efficiency devices, especially rare earth-doped fiber lasers have achieved unprecedented rapid development. Ytterbium-doped cladding-pumped fiber lasers can achieve high-power and high-beam-quality laser output, and are currently a hot spot in international research. [0003] High-power fiber lasers organically combine semiconductor laser pumping technology and double-clad fiber doping manufact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/00H01S3/23H01S3/10H01S3/067H01S3/08G02B6/02G02B6/24
Inventor 宁提纲胡旭东祁春慧郑晶晶刘艳谭中伟裴丽童治陈根祥延凤平
Owner BEIJING JIAOTONG UNIV
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