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Cross Section, Dispersion Curves, and Visible-light Supercontinuum Experiments of Optical Fibers
Luo Meisong, researcher of the High-power Laser Unit Technology R&D Center of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, led Liu Xiao, Wu Dakun, and others of the nonlinear optical fiber group to make new progress in the development of highly nonlinear photonic crystal fibers.
Highly nonlinear photonic crystal fiber is a core device for generating supercontinuum laser because it has special dispersion and high nonlinearity that ordinary step fiber does not possess. Supercontinuum is a high-brightness broadband light source with ultra-wide spectrum and high directivity. It has important applications in biomedical, ultra-fast spectroscopy, fiber optic communications, high-resolution imaging, and sensing technologies.
The highly non-linear quartz photonic crystal fiber is composed of small cores surrounded by micro-holes in the order of wavelength of air micropores, the structure of which is delicate and complicated, and the drawing process is extremely difficult. Based on the preliminary nonlinear optical fiber structure simulation design work, this research group used the stacking method to make a special structure of the optical fiber preform. By precisely controlling the temperature, tension, velocity, and other parameters in the optical fiber drawing process, a suitable 1 m doped ytterbium was developed. The fiber laser pumped photonic crystal fiber has an outer diameter of 120 μm, a core diameter of 5 μm, and a zero dispersion wavelength of 1040 nm. Using this fiber under the pump of a 1055 nm femtosecond fiber laser, the supercontinuum output spectrum covering the entire visible light band was obtained.
The successful development of this optical fiber indicates that Shanghai Opto-Mechanics has mastered the key technologies of the full-link core including high nonlinearity photonic crystal fiber structure design, preform production, and drawing, and lays an important foundation for the future realization of the device's application of the optical fiber.
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