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Mid-infrared cascade Raman fiber lasers

A Raman fiber and fiber laser technology, applied in lasers, laser components, phonon exciters, etc., can solve the problems of inability to realize infrared laser output and high optical transmission loss, and achieve high conversion efficiency, good beam quality, and structural simple compact effect

Inactive Publication Date: 2009-11-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, for these two kinds of fibers, the optical transmission loss is very high in the wavelength range greater than 2 μm, so the output laser light of the Raman laser based on these two kinds of fibers is mainly concentrated in the 1400-1600nm band, and it is impossible to realize the 3-5μm mid-infrared laser. output

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  • Mid-infrared cascade Raman fiber lasers
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Embodiment Construction

[0019] The present invention will be further described below by taking the accompanying drawings as an example. figure 1 is a schematic diagram of the structure of a mid-infrared cascaded Raman laser. The pump source 1 is a high-power Tm-doped 3+ A fiber laser, which is fused with a double-clad ZBLAN fiber 2, so that the pump light can be directly coupled into the ZBLAN fiber. Multiple pairs of fiber Bragg gratings 3 are respectively written on both ends of the ZBLAN fiber, and their central wavelengths correspond to the central wavelengths of Raman lasers of each order.

[0020] Research shows that the Raman frequency shift of ZBLAN fiber is 580cm -1 . Then if the pump light of 2 μm is used, the wavelength of Stokes light produced by the high-order Raman effect can be calculated, as figure 2 shown. It can be seen that the pump light of 2 μm can reach 3 μm with only three Raman frequency shifts, 3.73 μm with four Raman frequency shifts, and 4.76 μm with five Raman freque...

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Abstract

The invention discloses a mid-infrared cascade Raman fiber lasers, which is characterized by comprising a doubly coated ZBLAN fluoride fiber that comprises the following components: 53mol. % of ZrF4, 20mol. % of BaF2, 4mol. % of LaF3, 4mol. % of AlF3 and 20mol. % of NaF. One end of the doubly coated ZBLAN fluoride fiber is connected with a high power fiber-doped pump laser, and a cavity resonator of Raman lasers is formed by a plurality of fiber Bragg grating pairs inscribed on two ends of the ZBLAN fiber. By using the stimulated Raman effect of ZBLAN fiber, the Stokes light in all phases generated by Raman frequency shift of pump light form resonance in the fiber Bragg grating pairs to finally realize output of mid-infrared laser. The invention has the advantages of simple and compact structure, high beam quality, high conversation rate, solves the problem that the traditional fiber laser is difficult to generate laser in mid-infrared section, and can be widely used in various fields such as military, medical treatment, environmental monitoring and the like.

Description

technical field [0001] The invention belongs to the field of fiber lasers, in particular to a mid-infrared cascaded Raman fiber laser. Background technique [0002] The mid-infrared laser source with a wavelength of 3-5 μm has important applications in both military and civilian applications, and has become a research hotspot for laser workers in various countries. Fiber lasers are more advanced than traditional gas lasers and solid-state lasers in terms of beam quality, conversion efficiency, cooling method, and volume weight. Therefore, the development of 3-5 μm high-power mid-infrared fiber laser technology has important scientific significance and social value. [0003] Fiber laser can generally be realized by using doped fiber as the gain medium or by using the nonlinear effect stimulated Raman scattering in the fiber. The doping ions used in the mid-infrared band are generally Pr, Nd, Tb and Dy, but because the laser energy level of the laser doping ions in this band...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/30H01S3/067H01S3/094H01S3/081
Inventor 李剑峰刘永代志勇欧中华彭增寿张利勋刘永智
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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