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Double-cladding-layer Raman fiber

A layer Raman and optical fiber technology, applied in cladding optical fiber, multi-layer core/cladding optical fiber, graded index core/clad optical fiber, etc., can solve the problem of large core diameter, limited pump power, Problems such as poor beam quality of the output signal light, to achieve the effect of power improvement, beam quality, and laser output

Inactive Publication Date: 2014-03-19
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the pump power coupled into the single-clad Raman fiber is limited, the power of the output signal light is limited; while the step-type double-clad Raman fiber achieves high power output, its core diameter is large, and the supported There are many modes, so the beam quality of the output signal light is poor
So far, there is no patent report on the double-clad Raman fiber whose core refractive index distribution is graded

Method used

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  • Double-cladding-layer Raman fiber
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  • Double-cladding-layer Raman fiber

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Embodiment

[0020] a kind of like figure 2 The double-clad Raman fiber of the present invention shown, the double-clad Raman fiber comprises a core 1, an inner cladding 2, an outer cladding 3 and a coating 4, and the diameter of the core 1 is 50 μm (ie image 3 In 2a), the outer diameter of the inner cladding layer 2 is 125 μm, the outer cladding layer 3 and the coating layer 4 are the same medium, the outer diameter of the coating layer 4 is 250 μm, and the entire core 1 is doped with germanium ions (or phosphorus ions, etc.). On the cross section of the fiber core 1 , the concentration distribution of germanium ions is a conic curve distribution, and the germanium ions have the same conic curve concentration distribution on each cross section along the axis of the fiber core 1 . Such as image 3 Shown is the refractive index distribution curve 5 on the cross-section of the double-clad Raman fiber in this embodiment, and the refractive index n at the center of the core 1 1 is 1.4869,...

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Abstract

The invention discloses a double-cladding-layer Raman fiber. The double-cladding-layer Raman fiber sequentially comprises a fiber core, an inner cladding layer, an outer cladding layer and a coating layer, wherein a refractive index of the fiber core is greater than a refractive index of the inner cladding layer, the refractive index of the inner cladding layer is greater than a refractive index of the outer cladding layer, the refractive index of the outer cladding layer is greater than or equal to a refractive index of the coating layer, the fiber core of the double-cladding-layer Raman fiber internally contains doped ions, concentration distribution of the doped ions in the fiber core is in a gradual change distribution mode, so the refractive index of the fiber core is distributed in a gradual change mode. The double-cladding-layer Raman fiber not only can realize high-power laser output, but also can realize laser output with high beam quality.

Description

technical field [0001] The invention belongs to the field of Raman fiber lasers, including a Raman fiber oscillator and a Raman fiber amplifier, in particular to a double-clad Raman gain fiber for outputting high-power, high-beam-quality lasers. Background technique [0002] As an important supplement to doped fiber lasers, nonlinear fiber lasers and amplifiers have received widespread attention in recent years, especially the rapid development of Raman fiber lasers (RFL) and amplifiers (RFA). Unlike doped fiber lasers, the physical mechanism of RFL and RFA is to use the stimulated Raman scattering (SRS) effect in the fiber to obtain gain. Thanks to the wide gain spectrum (up to 40THz) and flexible gain wavelength of SRS, RFL and RFA can obtain the target wavelength output in a wide wavelength range as long as there is a suitable pumping source, covering almost the entire near-infrared And visible light range, so it has been widely used in the fields of optical communicatio...

Claims

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Application Information

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IPC IPC(8): G02B6/036G02B6/028
Inventor 王文亮黄良金冷进勇郭少锋曹涧秋孔令超王睿星黄值河姜宗福许晓军陈金宝刘泽金
Owner NAT UNIV OF DEFENSE TECH