Quartz rod structure for changing refractive index profile by external exposure method

A technology of refractive index distribution and quartz rods, which is applied in glass molding, glass manufacturing equipment, manufacturing tools, etc., can solve the problems of complex production process, difficulty in meeting the requirements of high-quality quartz rods, and difficulty in effectively improving quality accuracy, so as to avoid Unstable and large loss, reduce the maximum power per unit volume, and reduce the effect of loss

Inactive Publication Date: 2012-05-30
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: high-quality quartz rods required by high-power fiber lasers or amplifiers are difficult to meet the requirements; in some respects, although quartz rods can be produced to meet the requirements, the manufacturing process is too complicated and the quality accuracy is difficult to effectively improve

Method used

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  • Quartz rod structure for changing refractive index profile by external exposure method
  • Quartz rod structure for changing refractive index profile by external exposure method
  • Quartz rod structure for changing refractive index profile by external exposure method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] Embodiment 1, using external exposure method to change the refractive index distribution of the quartz rod structure, such as figure 1 , 2 , the quartz rod structure includes an exposure area 1 and an active quartz rod; the active quartz rod includes an active quartz rod core 2 and an outer cladding 3 , and the exposure area 1 is inside the active quartz rod core 2 .

[0020] The active quartz rod core 2 is a ytterbium-doped quartz rod with a radius of 3 mm. The thickness of the outer layer 3 is 1 mm, and the length of the active quartz rod is 0.5 mm.

[0021] The refractive index of the outer cladding 3 is selected to be 1.452, and the refractive index of the active quartz rod core 2 is 1.455.

[0022] From the left end face of the active quartz rod core 2, an ultraviolet laser is used to externally expose a 4*0.1mm rectangular area at the center of the active quartz rod core 2, so that the refractive index becomes 1.459, forming an exposure area 1.4* The 0.1mm rect...

Embodiment approach 2

[0024] Embodiment 2, using external exposure method to change the quartz rod structure of the refractive index distribution, such as image 3 , the quartz rod structure includes: exposure area 1 and an active quartz rod. The active quartz rod includes: an active quartz rod core 2 and an outer cladding 3 , and the exposure area 1 is inside the active quartz rod core 2 .

[0025] The active quartz rod core 2 is an erbium-doped quartz rod with a radius of 0.5 mm. The thickness of the outer layer 3 is 1 mm, and the length of the active quartz rod is 10 mm.

[0026] The refractive index of the outer cladding 3 is selected to be 1.450, and the refractive index of the active quartz rod core 2 is selected to be 1.453.

[0027] From the left end face of the active quartz rod core 2, external exposure is performed on a circular area with a diameter of 10 μm at a distance of 10 μm from the center of the active quartz rod core 2, so that the refractive index becomes 1.455, and the expos...

Embodiment approach 3

[0029] Embodiment 3, using external exposure method to change the quartz rod structure of refractive index distribution, such as Figure 4 , the quartz rod structure includes: exposure area 1 and an active quartz rod. The active quartz rod includes: an active quartz rod core 2 and an outer cladding 3 , and the exposure area 1 is inside the active quartz rod core 2 .

[0030] The active quartz rod core 2 is a ytterbium-doped quartz rod with a radius of 0.5 mm. The thickness of the outer layer 3 is 62.5 μm, and the length of the active quartz rod is 20 mm.

[0031] The refractive index of the outer cladding 3 is selected to be 1.451, and the refractive index of the active quartz rod core 2 is 1.454.

[0032] From the left end face of the active quartz rod core 2, a femtosecond laser is used to externally expose a circular area with a diameter of 10 μm at the center of the active quartz rod core 2, so that the refractive index becomes 1.457, and the exposure area 1 is formed. ...

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Abstract

The invention discloses a quartz rod structure for changing a refractive index profile by an external exposure method, and relates to the field of optical fiber amplifiers and optical fiber lasers. The quartz rod structure comprises an exposure area (1) and an active quartz rod, wherein the active quartz rod comprises an active quartz rod core (2) and an externally wrapping layer (3); the exposure area is formed in the active quartz rod core and is subjected to external exposure from the end of the active quartz rod core, and exposure light beams change the refractive index of the exposure area; and the refractive index of the exposure area, the refractive index of the active quartz rod and the refractive index of the externally wrapping layer are gradually decreased in turn, wherein the refractive index range of the exposure area is between 1.455 and 1.459, the refractive index range of the active quartz rod is between 1.453 and 1.455, and the refractive index range of the externallywrapping layer is between 1.450 and 1.452. The quartz rod structure solves the problem that a high-power optical fiber laser or amplifier needs a high-quality quartz rod, and ensures that the quartz rods with different shapes and refractive index profiles are manufactured simply and feasibly.

Description

technical field [0001] The invention relates to a quartz rod structure for changing the refractive index distribution by an external exposure method. Especially used in the field of fiber amplifiers and fiber lasers. Background technique [0002] Since the advent of lasers, its good coherence characteristics have been widely recognized. With the development of technology, the power of lasers has become larger and larger, and high-power lasers with special mode fields are increasingly used in parts processing, optical communication, and national defense. It has attracted people's attention, and its wide range of applications has led to more and more investment in structures that can generate laser output. Although some achievements have been made in some experiments, the structure of the laser generating device is too complicated, or the power is difficult to increase, or the characteristics of the laser cannot meet the requirements. The first reason is that the power that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B20/00
Inventor 宁提纲温晓东裴丽李晶周倩郑晶晶冯素春
Owner BEIJING JIAOTONG UNIV
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