掺Yb^(3+)双包层大模场面积微结构光纤光谱特性的研究

Research on Spectral Characteristics of Yb^(3+) Doped Double-Cladding Large-Mode-Area Micro-Structured Optical Fiber

掺Yb3+双包层大模场面积微结构光纤(micro-structured fibers,MSF)是作为超大功率光纤激光器的理想介质。本文首先采用非化学气相熔炼法制备出掺Yb3+石英基玻璃材料,然后按照设计要求,通过排布拉制法制备了掺Yb3+双包层大模场面积微结构光纤。分别利用钛宝石飞秒激光器(波长调至为975 nm)和波长为980 nm LD激光器作为激励源,对掺Yb3+双包层大模场面积微结构光纤的荧光光谱进行分析,实验结果表明:该光纤在波长为1 050 nm处产生强的荧光,同时该光纤还能有效的抑制合作发光现象(coopera-tive luminescence)的产生。

Yb3＋ doped double-cladding large-mode-area micro-structured optical fibers （Micro-structured fibers, MSF） are the ideal medium for the super high-power optical fiber laser applications. In the present paper, the authors fabricated the Yb3＋ doped silica-based glass using the method of non-chemical vapor deposition, and fabricated the Yb3＋ doped double-cladding large- mode-area MSF by stack-drawing method using this glass as the core of MSF, according to the design requirements. Fluores- cence spectrum of the MSF was obtained using Ti： sapphire femtosecond laser with the wavelength of 975 nm and LD laser with the wavelength of 980 nm as pumping source. The experimental results show that the optical fiber has strong fluorescence at the wavelength of 1 050 nm, and it can inhibit generation of cooperative luminescence effectively.