Liu Xiaoyu, Qu Shiliang, Tan Yang, Chen Feng
Department of Physics, Harbin Institute of Technology, Harbin 150001, China.
Appl Opt. 2011 Feb 20;50(6):930-4. doi: 10.1364/AO.50.000930.
We report on the preservation of fluorescence and Raman gain in low-repetition-rate femtosecond laser written buried channel waveguides in neodymium-doped KGd(WO4)2. The propagation loss index, profile reconstruction, and calculation of the modal intensity distribution by the beam propagation method of the waveguide are presented. Microluminescence spectra of the waveguides show that the fluorescence properties of Nd3+ ions are not significantly affected by the waveguide formation processing, which indicates a fairly good potential for further laser actions in a compact device. Micro-Raman spectra are also performed to reveal the preservation of the characteristic 768 and 901 cm-1 Raman mode intensities in the guiding regions.
我们报道了在掺钕的KGd(WO4)2中，低重复率飞秒激光写入的掩埋通道波导中荧光和拉曼增益的保留情况。给出了波导的传播损耗指数、剖面重建以及通过光束传播法计算的模态强度分布。波导的微发光光谱表明，Nd3+离子的荧光特性并未受到波导形成过程的显著影响，这表明在紧凑器件中进一步实现激光作用具有相当大的潜力。还进行了显微拉曼光谱分析，以揭示导光区域中特征性的768和901 cm-1拉曼模式强度的保留情况。
