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Femtosecond laser micromachining of waveguides in silicone-based hydrogel polymers

机译:飞秒激光微加工硅基水凝胶聚合物中的波导

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摘要

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 approx36percent 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.
机译:通过以93 MHz的重复频率紧密聚焦来自Ti:蓝宝石振荡器的具有1.3 nJ脉冲能量的27 fs激光脉冲,我们能够在水含量约36%的水凝胶聚合物中制造光波导。锥形透镜光纤用于在水环境中将波长为632.8 nm的激光耦合到这些波导中。由于大的折射率变化,观察到强波导。发现较大的波导传播损耗,并且我们证明这是由表面粗糙度引起的,可以通过优化波导来降低表面粗糙度。

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