Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Few-mode fiber Bragg grating capable of suppressing high-order mode reflection and laser system

A Bragg grating, few-mode fiber technology, applied in lasers, cladding fibers, optical waveguides, etc., can solve problems such as threshold drop, unfavorable increase in output power, oscillator mode instability, etc.

Pending Publication Date: 2020-10-30
NAT UNIV OF DEFENSE TECH
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these processes will reduce the mode instability threshold of the oscillator, which is not conducive to the improvement of output power.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Few-mode fiber Bragg grating capable of suppressing high-order mode reflection and laser system
  • Few-mode fiber Bragg grating capable of suppressing high-order mode reflection and laser system
  • Few-mode fiber Bragg grating capable of suppressing high-order mode reflection and laser system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] The present invention uses the overlapping degree of the transverse end face refractive index modulation region of the few-mode fiber Bragg grating and different modes to regulate the self-coupling coefficient of each mode and the mutual coupling coefficient between modes, thereby realizing the effect of the few-mode fiber Bragg grating on the LP 01 mode has higher reflection while the LP 11 The reflectivity of the mode is low. This kind of few-mode fiber Bragg grating capable of filtering out high-order modes can be realized by femtosecond laser face-to-face writing or dynamic writing combined wi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
radiusaaaaaaaaaa
Login to View More

Abstract

The invention provides a few-mode fiber Bragg grating capable of inhibiting high-order mode reflection and a laser system. A circular refractive index modulation area concentric with a fiber core is arranged in the fiber core of the few-mode optical fiber, the radius of the refractive index modulation area is smaller than that of the fiber core, the refractive index modulation area and an opticalfiber vector mode are both in circular symmetry, an LP01 mode and an LP11 mode cannot be mutually coupled, and energy exchange cannot occur in the LP01 mode and the LP11 mode. The self-coupling coefficient of the LP11 mode is lower than that of the LP01 mode, and the reflectivity of the LP11 mode is lower than that of the LP01 mode, so that reflection suppression of the LP11 mode is realized. Thefew-mode fiber Bragg grating can be used for a high-power fiber laser oscillator to serve as an endoscope, light reflection can be achieved, and mode regulation and control can also be achieved.

Description

technical field [0001] The invention relates to the technical field of fiber gratings, in particular to a few-mode fiber Bragg grating capable of suppressing high-order mode reflection and a laser system. Background technique [0002] In recent years, with the continuous improvement of power, beam quality and efficiency, high-power fiber lasers have played an increasingly important role in advanced manufacturing, national defense and other fields. In general, high-power fiber laser systems have two structures, namely fiber amplifiers and fiber oscillators. Among them, the fiber optic oscillator has the advantages of simple structure, stable system, and relatively low cost. In recent years, it has received more and more attention, and the output power level has achieved rapid growth. The maximum output power of the reported fiber optic oscillator has exceeded 8kW, and may break through 10kW soon. However, stimulated Raman scattering and mode instability effects are the key ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02H01S3/067
CPCG02B6/02076H01S3/0675
Inventor 王泽锋李宏业王蒙饶斌裕田鑫赵晓帆胡琪浩奚小明陈子伦潘志勇王小林许晓军陈金宝
Owner NAT UNIV OF DEFENSE TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com