Unlock instant, AI-driven research and patent intelligence for your innovation.

Raman optical fiber amplifier with light beam purification function

A Raman fiber and amplifier technology is applied in the field of beam purification based on graded index fiber, which can solve the problems of high cost, low brightness increase, and low power withstand.

Pending Publication Date: 2020-02-21
NAT UNIV OF DEFENSE TECH
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fiber oscillators require special custom-made fiber gratings based on graded-index fibers, which are expensive and can withstand low power, so they cannot be used for beam purification of high-power Raman lasers.
Raman fiber amplifiers are all based on power beam combining, and the brightness of the seed source decreases after passing through the power beam combiner. Even after the beam purification of the graded index fiber, the brightness improvement factor is still low

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
  • Raman optical fiber amplifier with light beam purification function
  • Raman optical fiber amplifier with light beam purification function
  • Raman optical fiber amplifier with light beam purification function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A Raman fiber amplifier with beam purification function, its structure is as figure 1 As shown, it includes a seed source 1, a high-power fiber laser pump source array 2, a pump signal combiner 3, a Raman fiber 4, and an end cap 5; the seed source 1 is a laser source with a signal light wavelength, which Connected to the central signal arm of the pump signal combiner 3; the output arms of the high-power fiber laser pump source array 2 are respectively connected to the pump input arms of the pump signal combiner 3; and the pump signals are combined The output end of the beamer 3 is connected to the Raman fiber 4, the other end of the Raman fiber 4 is connected to the end cap 5, and the Raman laser is output through the end cap 5, the Raman fiber 4 is a graded index fiber; The output fiber of the pump signal combiner 3 and the end cap 5 are the same graded index fiber as the Raman fiber 4. The same here refers to the gradient direction, gradient rate, core size, refractive ...

Embodiment 2

[0035] A Raman fiber amplifier with beam purification function, its structure is as Figure 4 As shown, in addition to the components in the above embodiment 1, it also includes a fiber grating 8. One end of the fiber grating 8 is connected to the fusion point of the output fiber of the pump signal combiner 3 and the Raman fiber 4. One end is connected to the fusion splice point between the Raman fiber 4 and the end cap 5, so that the fiber grating 8 and the Raman fiber 4 are connected in parallel between the pump signal combiner 3 and the end cap 5.

Embodiment 3

[0037] A Raman fiber amplifier with beam purification function, its structure is as Figure 5 As shown, in addition to the components in the above-mentioned embodiment 1 or 2, it also includes a next-stage amplifier, which includes an isolator 9, a second high-power fiber laser pump source array 10, and a second pump The signal combiner 11 and the second Raman fiber 12, the next stage amplifier is connected to the upper stage amplifier as the seed source through the isolator 9. When the structure in embodiment 1 is used as the upper stage amplifier, the pull The output end of the Mann fiber 4 is connected to the input arm of the isolator 9, and the output arm of the isolator 9 is connected to the central signal arm of the second pump signal combiner 11, and the remaining pump arms of the second pump signal combiner 11 It is connected to the second high-power fiber laser pump source array 10, and the output fiber of the second pump signal combiner 11 is connected to the second R...

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
wavelengthaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of fiber lasers, and provides a Raman optical fiber amplifier with a light beam purification function. The amplifier comprises a seed source (1), a high-power fiber laser pumping source array (2), a pumping signal combiner (3), a Raman optical fiber (4) and an end cap (5). The seed source (1) is connected with the central signal arm of the pumping signal combiner (3). The output arms of the high-power fiber laser pumping source array (3) are connected with the pumping input arms of the pumping signal combiner (3) respectively. The output end of thepumping signal combiner (3) is connected with the Raman optical fiber (4). The other end of the Raman optical fiber (4) is connected with the end cap (5). The output optical fiber of the pumping signal combiner (3) and the tail fiber of the end cap (5) are graded index optical fibers which are the same as the Raman optical fiber (4), which means that the refractive index gradient direction, the gradient rate, the fiber core size and the refractive index value distribution of the optical fibers are the same.

Description

Technical field [0001] The present invention generally belongs to the technical field of fiber lasers, and specifically relates to a beam purification method based on a graded index fiber. Background technique [0002] Graded-index fiber is also called square-law fiber. The refractive index distribution of the multimode core is parabolic, that is, the core refractive index has a square-law relationship with the radial distance. As the radial distance increases, the refractive index gradually decreases. Due to the parabolic distribution of the refractive index, the graded-index fiber is similar to the fiber convex lens and has the characteristics of self-focusing. The mode transmission in the fiber core is not affected by the bending of the fiber and has the ability to maintain brightness. In addition, the Raman gain coefficient of the region where the fundamental mode is located in the core is higher than that of the high-order mode, which has a stronger Raman gain extraction cap...

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): H01S3/067H01S3/10H01S3/108H01S3/13
CPCH01S3/06725H01S3/06745H01S3/06754H01S3/10023H01S3/1086H01S3/1301
Inventor 姚天甫陈薏竹张扬范晨晨陈潇马小雅李阳许将明冷进勇肖虎黄良金刘伟周朴
Owner NAT UNIV OF DEFENSE TECH