He Ruiyun, An Qiang, Vázquez de Aldana Javier R, Lu Qingming, Chen Feng
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, China.
Appl Opt. 2013 Jun 1;52(16):3713-8. doi: 10.1364/AO.52.003713.
The optical waveguides in Bi(4)Ge(3)O(12) (BGO) crystals in both depressed-cladding and dual-line configurations have been produced using femtosecond-laser micromachining. The guiding properties and thermal stabilities of the BGO waveguides have been investigated for both geometries, showing different performance of the fabricated structures. Both depressed-cladding and dual-line waveguides support guidance along both TE and TM polarizations. Thermal annealing treatments up to 600°C reduce the propagation loss of dual-line waveguides to as low as 0.5 dB/cm, while the cladding waveguide is only stable under thermal treatment not higher than 260°C, reaching a propagation loss of 2.1 dB/cm.
通过飞秒激光微加工，已在Bi(4)Ge(3)O(12)（BGO）晶体中制备出凹陷包层和双线配置的光波导。对这两种几何结构的BGO光波导的导光特性和热稳定性进行了研究，结果表明所制备结构具有不同的性能。凹陷包层和双线光波导都支持TE和TM偏振方向的导光。高达600°C的热退火处理可将双线光波导的传输损耗降低至低至0.5 dB/cm，而包层光波导仅在不高于260°C的热处理下稳定，传输损耗达到2.1 dB/cm。
