Recently, China's active photonic crystal fiber made significant progress. Shanghai Optical's high-power laser unit technology research and development center of quartz fiber materials group successfully prepared a core diameter greater than 50 μm, NA is less than 0.03 large diameter photonic crystal fiber. Large-field photonic crystal fiber in the military, industrial processing and other important potential applications, NKT company introduced 40/200 and 85/260 two wide range of optical fibers, and occupy the vast majority of the market, but the two fibers in the country The price is high. The domestic photonic crystal active optical fiber preparation technology lags behind, can not be prepared with a core diameter greater than 30μm very low NA large mode field photonic crystal fiber, long-term dependence on imported products, which greatly limits the domestic research and development of ultra-short pulse fiber laser amplifier . This breakthrough breaks the monopoly of high brightness large-mode photonic crystal fiber production technology mastered by only a handful of companies such as NKT in the world, laying the core of the laser material for the development of large-energy ultra-short pulse fiber laser amplifiers in China. Small Plastic Parts Making Machines
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