China's active photonic crystal fiber preparation breaks the foreign technology monopoly

Recently, China's active photonic crystal fiber development has made important progress
.
The quartz optical fiber material research group of the high-power laser unit technology R&D center of Shanghai Institute of Optics and Machinery successfully prepared a large-core diameter photonic crystal fiber
with a core diameter greater than 50 μm and a NA less than 0.
03.

The important application potential of large mode field photonic crystal fiber in military, industrial processing and other aspects, NKT company launched 40/200 and 85/260 two optical fibers are widely used, and occupy most of the market, but the above two optical fibers in the domestic price is extremely high
.

The preparation technology of domestic photonic crystal active optical fiber is seriously lagging behind, and it is impossible to prepare large-mode field photonic crystal fiber with a core diameter greater than 30μm with a very low NA, which has long relied on imported products, which greatly limits the research and development
of domestic ultrashort pulse fiber laser amplifiers.

This breakthrough breaks the international monopoly of high-brightness large-mode field photonic crystal fiber preparation technology mastered only by a very few companies such as NKT, and lays the core laser material foundation
for the development of high-energy ultrashort pulse fiber laser amplifiers in China.