Eigner Christof, Santandrea Matteo, Padberg Laura, Volk Martin F, Rüter Christian E, Herrmann Harald, Kip Detlef, Silberhorn Christine
Opt Express. 2018 Oct 29;26(22):28827-28833. doi: 10.1364/OE.26.028827.
Waveguide circuits play a key role in modern integrated optics and provide an appealing approach to scalability in quantum optics. We report on periodically poled ridge waveguides in z-cut potassium titanyl phosphate (KTiOPO or KTP), a material that has recently received growing interest due to its unique dispersion properties. Ridges were defined in surface-near rubidium-exchanged KTP by use of a precise diamond-blade dicing saw. We fabricated single-mode ridge waveguides at around 800 nm which exhibit widths of 1.9-3.2 μm and facilitated type-II second harmonic generation from 792 nm to 396 nm with high efficiency of 6.6 %/W·cm. Temperature dependence of the second harmonic process was found to be 53 pm/K. The low temperature dependence and high nonlinear conversion efficiency make our waveguides ideally suited for future operations in classical nonlinear integrated optics and integrated quantum networking applications.
波导电路在现代集成光学中起着关键作用，并为量子光学中的可扩展性提供了一种有吸引力的方法。我们报道了在z切割磷酸钛氧钾（KTiOPO或KTP）中的周期性极化脊形波导，这种材料由于其独特的色散特性最近受到越来越多的关注。通过使用精密的金刚石刀片切割锯在表面附近铷交换的KTP中定义脊形。我们制造了波长约为800nm的单模脊形波导，其宽度为1.9 - 3.2μm，并促进了从792nm到396nm的II型二次谐波产生，效率高达6.6%/W·cm。发现二次谐波过程的温度依赖性为53pm/K。低温度依赖性和高非线性转换效率使我们的波导非常适合未来在经典非线性集成光学和集成量子网络应用中的操作。
