Zhou Bo, Lin Hai, Chen Baojie, Pun Edwin Yue-Bun
Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.
Opt Express. 2011 Mar 28;19(7):6514-23. doi: 10.1364/OE.19.006514.
Superbroadband emission from 1.0 to 1.7 μm wavelength was observed in thulium-bismuth (Tm-Bi) codoped sodium-germanium-gallate (NGG) glasses under 793 nm excitation. Efficient energy transfer process from Bi to Tm ions, with value as high as 67.7%, was achieved which is beneficial in achieving flat broadband lineshape. The large stimulated emission cross-section and measured lifetime confirm the potentials of Tm-Bi codopants as luminescence sources for superbroadband near-infrared (NIR) optical amplifiers and tunable lasers. Planar optical waveguides were fabricated successfully in the codoped NGG glasses using K(+)-Na(+) ion-exchange process.
在793 nm激发下，在铥铋（Tm-Bi）共掺杂的镓酸钠锗（NGG）玻璃中观察到了波长范围为1.0至1.7μm的超宽带发射。实现了从Bi到Tm离子的高效能量转移过程，转移效率高达67.7%，这有利于实现平坦的宽带线形。大的受激发射截面和测量得到的寿命证实了Tm-Bi共掺杂剂作为超宽带近红外（NIR）光放大器和可调谐激光器发光源的潜力。利用K(+)-Na(+)离子交换工艺成功地在共掺杂的NGG玻璃中制备了平面光波导。
