Smelser Christopher W, Mihailov Stephen J, Grobnic Dan
Communications Research Centre Canada, 3701 Carling Avenue, P.O. Box 11490, Station H, Ottawa, Ontario K2H 8S2, Canada.
Opt Lett. 2004 Sep 15;29(18):2127-9. doi: 10.1364/ol.29.002127.
The threshold for the fabrication of fiber Bragg gratings with ultrafast 800-nm radiation and a phase mask was studied in SMF-28 and all-silica core fiber by use of 125-fs pulses. High-pressure molecular hydrogen loading (H2 loading) was observed to significantly lower the grating writing threshold in standard Ge-doped telecommunication fiber. No reduction was observed with all-silica core fiber. The index change appeared to be confined to the Ge-doped core region of the fiber. Gratings in H2-loaded SMF-28 had thermal annealing behavior similar to UV-induced gratings. Unlike UV-induced H2-loaded gratings, no absorption associated with Ge-OH defect formation was observed.
利用125飞秒脉冲，在SMF - 28单模光纤和全石英纤芯光纤中研究了使用超快800纳米辐射和相位掩膜制造光纤布拉格光栅的阈值。研究发现，在标准掺锗通信光纤中，高压分子氢加载（H₂加载）可显著降低光栅写入阈值。而在全石英纤芯光纤中未观察到阈值降低。折射率变化似乎局限于光纤的掺锗纤芯区域。H₂加载的SMF - 28光纤中的光栅具有与紫外诱导光栅相似的热退火行为。与紫外诱导的H₂加载光栅不同，未观察到与锗 - 羟基缺陷形成相关的吸收现象。
