Sm^(+2)/Sm^(+3)掺杂铝硅基玻璃光纤的光敏特性研究

Photosensitivity Studies of Sm^(-2)/Sm^(+3) Doped Alumionosilicate Fiber

用2W多线输出功率的氩离子激光器照射Sm－2／Sm－3掺杂铝硅基玻璃光纤能产生5．1×10－3％的永久性折射率变化。通过测定LP11模截止波长的偏移能检测该光纤的光敏特性，同时在可见光区域能观察到宽消感应吸收带。Sm掺杂光纤光敏特性是由多光子增强的Sm+2离子消感应吸收过程所致。

A permanent index change of 0. 0051 % was induced in Sm-2/Sm+3 doped aluminosilicate fiber by irradiating 2W of multi-line output from an Ar ion laser. The photosensitivity was detected by measuring a shift in LP11 mode cutoff wavelength. Bleaching of a broad absorption band in the visible was also observed. The origin of the photosensitivity in the Sin doped optical fiber is the bleaching of Sin--Zion absorption bands enhanced by nultiphoton processes.