Shanghai Institute of Optical new crystal fiber research and development progress

According to the report of China Science News, Liu Yin-wu and Wu Da-kun, led by researcher Liao Meisong from Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, have made new progress in the development of highly nonlinear photonic crystal fibers.

Due to the special non-linearity and high dispersion nonlinearity of high-order nonlinear photonic crystal fiber, it is the core device of supercontinuum laser. Supercontinuum is a high brightness broadband light source with ultra-wide spectrum and high directivity. It has important applications in biomedicine, ultrafast spectroscopy, optical fiber communication, high resolution imaging and sensing technology.

The high-nonlinearity quartz photonic crystal fiber is composed of a plurality of small-size core surrounded by air micropores in the order of the wavelength. The structure of the optical fiber is very complicated and the drawing process is extremely difficult. By precisely controlling the parameters such as temperature, tension and velocity in the process of fiber drawing, the research group developed a photonic crystal fiber which is suitable for pumping 1μm Ytterbium-doped fiber laser and has an outer diameter of 120μm and a core diameter of 5μm. The zero-dispersion wavelength is 1040nm. Using this fiber, a 1055nm femtosecond fiber laser was pumped to obtain a supercontinuum output with a spectrum covering the entire visible band.

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