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High power fiber laser of active lock phase multi-core interference coat pump and its making method

A technology of fiber lasers and multi-core fibers, which is applied in the direction of cladding fibers, lasers, laser components, etc., can solve the problems of strict consistency requirements, difficult process realization, unfavorable applications, etc., and achieve simplified manufacturing process requirements and simplified complex feedback Control system, easy to implement effects

Inactive Publication Date: 2008-08-06
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of self-organized multi-core fiber laser has extremely strict requirements on the consistency of each fiber core, and its in-phase output is guaranteed by the high consistency of the parameters of each fiber core. Reports on the use of such fibers for power fiber lasers; and passive phase-locking, the role of a certain core is random, which is easy to cause wavelength drift and power fluctuations, which is not conducive to application

Method used

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  • High power fiber laser of active lock phase multi-core interference coat pump and its making method

Examples

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Effect test

Embodiment 1

[0034] Using multi-core fiber to make multi-core active phase-locked fiber laser. Option 1, as shown in Figure 1, coat the 11 end faces of the multi-core optical fiber with a high-reflection film. Which wavelength the high-reflection film has high reflection depends on the needs. High-reflection films with different reflection wavelengths can be coated; The 12-end end face of the core fiber is cut flat, and the core in the center of the multi-core fiber is written into the grating. The wavelength of the grating is selected according to the wavelength to be excited, and no grating is written on the remaining cores of the 12-end end face. The centermost fiber core constitutes the main resonant cavity.

[0035] Option 2, as shown in Figure 1, write high-reflectivity gratings in all the cores of the 11-end facet of the multi-core optical fiber. Which wavelength the high-reflection grating is highly reflective depends on the need and can be written in different High-reflectivity g...

Embodiment 2

[0038] The present invention does not involve pumping methods, and can use end pumping, side pumping, coupler pumping, etc., all of which are owned by the patent holder or the document reporter.

[0039] The doped fiber used in Embodiment 2 is an ytterbium-doped fiber, and a resonant cavity is constructed in a multi-core fiber.

[0040] As shown in Figure 2, it is an actively phase-locked multi-core coherent fiber laser using end-pump coupling. The specific implementation plan is as follows:

[0041] Step 1. Prepare a multi-core cladding pumping fiber. The length of the multi-core fiber depends on the doping concentration, pump power and fiber background loss.

[0042] Step 2, as shown in FIG. 2 , smooth the end faces 11 and 12 of the multi-core cladding pumping fiber.

[0043] Step 3, coating the end face 11 with a film with high reflection to the resonant wavelength of the laser and a film with high transmittance to pump light such as 975nm.

[0044] Step 4: Write gratin...

Embodiment 3

[0049]The present invention does not involve pumping methods, and can use end pumping, side pumping, coupler pumping, etc., all of which are owned by the patent holder or the document reporter.

[0050] The doped fiber used in Embodiment 3 is an ytterbium-doped fiber, and a resonant cavity is constructed in a multi-core fiber.

[0051] As shown in Figure 2, it is an actively phase-locked multi-core coherent fiber laser using end-pump coupling. The specific implementation plan is as follows:

[0052] Step 1. Prepare a multi-core cladding pumping fiber. The length of the multi-core fiber depends on the doping concentration, pump power and fiber background loss.

[0053] Step 2, as shown in FIG. 2 , smooth the end faces 11 and 12 of the multi-core cladding pumping fiber.

[0054] Step 3, writing gratings in all the fiber cores in the end face 11, and the reflection wavelengths of the written gratings are the same.

[0055] Step 4: Write gratings in the middle core 22 of the c...

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Abstract

The present invention relates to an active phase locking multi-core coherent cladding pump high-power optical fiber laser and a preparation method thereof. Active medium is used to manufacture fiber cores; the fiber cores can be arranged according to a certain law or in any mode; the distance among the fiber cores can be long or short under the condition of satisfying synergistic coupling; the quantity of the fiber cores can be great or small according to needs. One end of a multi-core optical fiber is coated with a film, and the other end of the multi-core optical fiber is cut flat; only one of the fiber cores is written into a grating to form a main resonant cavity together with a coating surface, so as to play a role in active resonant phase locking without adding an extra phase locking feedback control system. The optical fiber laser can greatly lower the requirement of passive phase locking multi-core optical fiber lasers on multi-core optical fiber consistency, simplify the requirements of the multi-core optical fiber on fabrication process, and simplify the complex feedback control system of the prior active phase locking optical fiber laser. The optical fiber laser is also characterized in little influence from environment, compact structure, easy implementation, etc.

Description

technical field [0001] The invention relates to an active phase-locked multi-core coherent cladding-pumped high-power fiber laser and a preparation method, an active multi-core cladding pumping optical fiber and a fixed-point writing technology of an optical fiber grating, especially an active phase-locking multi-core coherent package A layer-pumped high-power fiber laser belongs to the fields of high-power lasers, special optical fibers, fiber laser bundles, 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 res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/00H01S3/067H01S3/08H01S3/10G02B6/02
Inventor 宁提纲延凤平童治谭中伟刘艳陈根祥裴丽李坚简水生
Owner BEIJING JIAOTONG UNIV
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