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 Aluminosilicate Fiber

用2 W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0.005 1％的永久性折射率变化。通过测定LP_(11)模截止波长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。钐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. 005 1% was induced in Sm+2/Sm+3 doped aluminosilicate fiber by irradiating 2 W of multi-line output from an Ar ion laser. The photosensitivity was detected by measuring a shift in LPn mode cutoff wavelength. Bleaching of a broad absorption band in the visible was also observed. The origin of the photosensitivity in the Sm doped optical fiber is the bleaching of Sm+2 ion absorption bands enhanced by multiphoton processes.