High-energy short-pulse fiber laser amplifier
A fiber laser and short pulse technology, which is applied in the direction of lasers, laser components, cladding optical fibers, etc., to achieve the effects of laser amplification with compact structure, weakened modulation effect, and high energy
Inactive Publication Date: 2014-10-08
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
Therefore, the biggest challenge to achieve high-energy short-pulse amplification in optical fibers is to reduce the influence of nonlinear effects
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[0021] figure 1 It is a schematic diagram of the principle of the high-energy short-pulse fiber laser amplifier of the embodiment of the present invention, wherein the pumping method is that the multi-mode semiconductor pump light source is coupled into the forward direction of the large-mode field double-clad rare-earth-doped phosphate glass fiber through a fiber combiner. pump. The large mode field double-clad rare earth-doped phosphate glass fiber 3 is used as a laser amplification medium, and is connected to the output port of the (n+1)×1 fiber combiner 2 . The laser pumping method adopts forward pumping, and the pumping light generated by n multimode semiconductor pumping light sources 1 is respectively coupled into the large-mode field dual channel via n pumping ports of (n+1)×1 fiber combiner 2. Cladding rare earth doped phosphate glass fiber 3 for pumping ( figure 1 ). The large mode field double-clad rare-earth-doped phosphate glass optical fiber 3 is made of a p...
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The invention provides a high-energy short-pulse fiber laser amplifier which comprises a novel large-mode-field double-cladding rare-earth-doped phosphate glass optical fiber, an optical fiber combiner and a multi-mode semiconductor pump light source. A high-grain double-cladding glass optical fiber is adopted as a laser amplification medium, the pump suction coefficient is ten times larger than that of a commercial similar quartz optical fiber, and high-energy short-pulse lasers with the energy of tens mJ can be outputted within the small optical fiber length. The large-mode-field double-cladding rare-earth-doped phosphate glass optical fiber serving as the laser amplification medium is short (can reach the centimeter magnitude), the modulation effect of reducing the light intensity and fiber core refractive index can be achieved for the large mode field area, and therefore the low-order nonlinear effect in the optical fiber is quite small, and the whole laser amplification structure is more compact while more stable and higher-energy pulse lasers are be outputted. The high-energy short-pulse fiber laser amplifier can be applied to the fields of laser radar, laser ranging and indicating, remote sensing and the like.
Description
Technical field [0001] The present invention involves high -energy short pulse laser technology fields, which specifically involves a high -energy short pulse fiber laser enlarged amplifier. Background technique [0002] High -energy short -pulse laser light sources are applied in the fields of laser radar, laser ranging and instructions, and long -distance sensing.The laser pulse energy directly determines its working distance. Therefore, the end -level optical leaflet technology before the output of high energy short pulse laser is important. [0003] At present, there are two main types of high -energy short pulse laser enlarged technology: crystals and fiber.Compared with the amplification of full -solid lasers such as crystals, the optical fiber amplification scheme with high energy short pulse has the advantages of full fiber fiberization, small volume and compactness, good beam quality, and no heat prism effect.However, compared with the full -solid laser amplifier in term...
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IPC IPC(8): H01S3/067H01S3/10G02B6/036G02B6/02
Inventor 徐善辉杨中民李灿冯洲明
Owner SOUTH CHINA UNIV OF TECH