Ultra-short pulse Raman optical fiber amplifier

A technology of ultra-short pulse and Raman fiber, which is applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of insufficient practicability, laser output noise, and high system complexity, and achieve high Raman gain and good coherence effect

Inactive Publication Date: 2020-11-27
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pulsed laser synchronous pumping technology requires a long-term locking of the pulse repetition frequency and the Raman resonator, and any slight deviation will be converted into laser output noise
Although it is possible to obtain high-energy, high-efficiency ultrafast Raman laser output, but to obtain low-noise output, the system complexity is high and the practicability is insufficient

Method used

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Examples

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Embodiment 1

[0022] Example 1, see figure 1 .

[0023] figure 1 It is a schematic block diagram of the structure of the ultrashort pulse Raman fiber amplifier. Pulse laser pump source 1, continuous optical signal source 2, pump / signal laser beam combining device 3, Raman gain fiber 4, pump / signal beam splitting device 5 through the fiber fusion splicer such as figure 1 Welded together. The center wavelength of the pulsed laser pumping source 1 is 1117nm, and the pulse width is <100ps. The central wavelength of the continuous optical signal source 2 is 1310 nm. The pump / signal laser beam combiner 3 is a 1117nm / 1310nm wavelength division multiplexer. The Raman gain fiber 4 is a phosphorus-doped silica fiber, and the Raman gain is 1.2 / (W·km). The pump / signal laser beam splitter 5 is a 1117nm / 1310nm wavelength division multiplexer.

Embodiment 2

[0024] Example 2, see figure 2 .

[0025] figure 2 Schematic block diagram of the multi-wavelength pumping structure for the ultrashort pulse Raman fiber amplifier. The central wavelengths of the pulsed laser pumping source 11, the pulsed laser pumping source 12, and the pulsed laser pumping source 13 are 1064nm, 1067nm, and 1070nm respectively, and the pulse width is <100ps. The laser combining device 14 is a wavelength division multiplexer. The continuous optical signal source 2 has a central wavelength of 1120nm and a line width of <10nm. The pump / signal laser beam combiner 3 is a wavelength division multiplexer. The Raman gain fiber 4 is a polarization-maintaining silica fiber, and the Raman gain is 1.8 / (W·km). The pumping / signal laser beam splitting device 5 is a 1067nm / 1120nm wavelength division multiplexer.

Embodiment 3

[0026] Example 3, see image 3 .

[0027] image 3 It is a schematic block diagram of the multi-signal injection structure of the ultrashort pulse Raman fiber amplifier. The center wavelength of the pulsed laser pumping source 1 is 1064nm, and the pulse width is <100ps. The central wavelengths of the continuous optical signal source 21 , the continuous optical signal source 22 , and the continuous optical signal source 23 are 1120 nm, 1178 nm, and 1238 nm, respectively, and the line width is <1 nm. The laser beam combiner 24 is a wavelength division multiplexer. The pump / signal laser beam combiner 3 is a wavelength division multiplexer. The Raman gain fiber 4 is a polarization-maintaining silica fiber, and the Raman gain is 2.5 / (W·km). The pump / signal laser beam splitter 5 is a wavelength division multiplexer. Under the excitation of the pulsed laser pump source 1, the continuous optical signal source 21, the continuous optical signal source 22 and the continuous optical...

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Abstract

The invention relates to an ultra-short pulse Raman optical fiber amplifier which is formed by sequentially connecting a pulse laser pumping source, a continuous optical signal source, a pumping/signal laser beam combining device, a Raman gain optical fiber and a pumping/signal beam splitting device into a whole through an optical fiber fusion splicer. Ultra-short pulse laser is adopted as a pumping source, and continuous wave signal laser is amplified in a Raman optical fiber amplifier. Due to the rapid response process of stimulated Raman scattering, the continuous wave signal laser can be amplified into ultra-short pulse laser. The optical fiber amplifier has the advantages of high Raman gain, good coherence, large laser pulse energy, narrow pulse width, simple structure and the like, and has great practical value and application prospect.

Description

technical field [0001] The invention relates to an ultrashort pulse Raman fiber amplifier, which has the advantages of good coherence, large laser pulse energy, narrow pulse width and simple structure, and is an all-fiber amplifier capable of generating ultrashort pulse laser with special wavelength. Background technique [0002] Ultrashort pulse lasers have great application prospects in basic research, biomedicine, industrial processing, optical communication and other fields. At the same time, fiber lasers have the advantages of compact structure, no need to adjust the optical path, high beam quality, and high efficiency. Extending ultrafast fiber lasers to the wavelength bands that cannot be covered by ion transitions is an actual demand for many applications in medical, scientific research and other fields. Stimulated Raman scattering (SRS) in optical fibers provides a potential means to obtain full-band ultrafast lasers. It does not depend on the electronic energy le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/094H01S3/108
CPCH01S3/06754H01S3/094046H01S3/1086
Inventor 冯衍祁伟骜周佳琦
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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