Multi-clad Raman fiber amplifier

A Raman amplifier and multi-cladding technology, which is applied in the field of cascaded Raman fiber amplifiers, can solve the problems of limiting the brightness improvement of Raman fiber lasers, and achieve the effect of improving laser output brightness and output power

Active Publication Date: 2018-02-13
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, if a general double-clad fiber is used as the gain medium, in order to obtain a higher conversion efficiency, the cladding core area ratio must be less than 8, which limits the brightness improvement of the double-clad pumped Raman fiber laser.

Method used

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  • Multi-clad Raman fiber amplifier

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Embodiment 1

[0019] see figure 1 , image 3 . figure 1 It is a schematic block diagram of the structure of the Raman amplifier embodiment 1 of the four-clad fiber of forward pumping, image 3 It is the specific form of the four-clad fiber in the present invention. 31 in the figure is the outermost cladding layer of the four-clad fiber, which is the coating layer, and 32 is the second cladding layer, which is generally pure SiO 2 , used to conduct pumping light, 33 and 34 are the third cladding layer and the fourth cladding layer doped with germanium, and 35 is the fiber core. The Raman amplifier mainly includes a multi-wavelength seed source 1, a pump source 2, a wavelength division multiplexer 3 and a four-clad gain fiber 4. The pump light provided by the pump source 2 and the signal light of different wavelengths provided by the multi-wavelength seed source 1 are respectively injected into different cladding layers and cores of the four-clad gain fiber 4 through the wavelength divisi...

Embodiment 2

[0021] see figure 2 , image 3 . figure 2 It is a schematic block diagram of the structure of the Raman amplifier embodiment 2 of the four-clad fiber of the back pump, image 3 It is the specific form of the four-clad fiber in the present invention. The difference between this embodiment and Embodiment 1 mainly lies in the back transmission of the pump light. The Raman amplifier mainly includes a multi-wavelength seed source 1 , wavelength division multiplexers 31 and 32 , a four-clad gain fiber 4 and a pump source 2 . The signal light of different wavelengths provided by the multi-wavelength seed source 1 enters the multi-clad gain fiber 4 through the wavelength division multiplexer 31, and the pump light is coupled into the multi-clad fiber 4 through the wavelength division multiplexer 32, and the back transmission is to the signal Light is amplified.

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Abstract

A multi-clad fiber Raman fiber amplifier, its structure includes a multi-wavelength seed source, a pump source, a wavelength division multiplexer and a multi-clad gain fiber. The low-brightness pump laser output by the pump source propagates in the second cladding layer of the multi-clad fiber, and generates Raman frequency-shifted laser light in the third cladding layer of the fiber through stimulated Raman scattering. The generated Raman laser is also used as the pump light to pump the higher-order Raman light in the inner layer, which in turn realizes the cladding cascade Raman frequency shift, and finally obtains high-brightness laser output in the fiber core. The invention can overcome the limitation of the cladding core area ratio on the output brightness and power of the laser in the double-clad Raman fiber laser through cladding cascade pumping, and can improve the output brightness and power of the Raman fiber laser.

Description

technical field [0001] The invention relates to a Raman optical fiber amplifier, in particular to a cascaded Raman optical fiber amplifier based on cascaded cladding pumping of multi-clad optical fibers. Background technique [0002] High-power fiber lasers have the characteristics of good beam quality, high efficiency, compact structure and good heat dissipation, and have important applications in laser processing, optical communication, laser medical treatment and military fields. At present, there are mainly the following ways to use optical fiber as a gain medium to obtain high-power laser output: [0003] 1. High-power laser output is obtained by using rare earth ion-doped double-clad fiber as a gain medium. The rare earth ions used for doping are Er 3+ , Yb 3+ 、Tm 3+ 、Ho 3+ etc. Currently, Yb ion-doped fiber laser technology is the most mature [Refer to literature: Valentin Gapontsev, V.Fomin, A. Ferin, and M. Abramov, "Diffraction Limited Ultra-High-Power Fiber L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/30
Inventor 冯衍姜华卫张磊
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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