Ding Li, Blackwell Richard I, Künzler Jay F, Knox Wayne H
The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Appl Opt. 2008 Jun 10;47(17):3100-8. doi: 10.1364/ao.47.003100.
By tightly focusing 27 fs laser pulses from a Ti:sapphire oscillator with 1.3 nJ pulse energy at 93 MHz repetition rate, we are able to fabricate optical waveguides inside hydrogel polymers containing approximately 36% water by weight. A tapered lensed fiber is used to couple laser light at a wavelength of 632.8 nm into these waveguides within a water environment. Strong waveguiding is observed due to large refractive index changes. A large waveguide propagation loss is found, and we show that this is caused by surface roughness which can be reduced by optimizing the waveguides.
通过将来自钛宝石振荡器的27飞秒激光脉冲紧密聚焦，其脉冲能量为1.3纳焦，重复频率为93兆赫，我们能够在按重量计含有约36%水的水凝胶聚合物内部制造光波导。一根锥形透镜光纤用于在水环境中将波长为632.8纳米的激光耦合到这些光波导中。由于大的折射率变化，观察到了强波导现象。发现了较大的光波导传播损耗，并且我们表明这是由表面粗糙度引起的，通过优化光波导可以降低表面粗糙度。
