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Optimization design of aperiodic optical superlattices for harmonic generations

机译：谐波产生的非周期性光学超晶格的优化设计

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Abstract: We present the optimization design of aperiodic optical superlattices (AOSs) realized by inverting poled ferroelectric domains in sample. This design problem belongs to solving an inverse source problem in nonlinear optics. The optical design of the AOS can be achieved with use of the simulated annealing method. The constructed AOSs can implement multiple wavelength second-harmonic generation and the coupled third-harmonic generation with an identical effective nonlinear coefficient, at the preassigned wavelengths. The simulations show that the harmonic generations in the constructed AOSs can approach the prescribed goal better than those with the Fibonacci optical superlattice. The effective nonlinear coefficients vs the optical wave propagating distance from the impinging surface of incident light in samples exhibit monotonically increasing behavior. This clearly infers that the contribution form every block to the otpical parametric processes is with each other in the constructive interference state. It is expected that this new design method may provide an effective and useful technique for flexibly constructing nonlinear optical material to achieve the desired functions and match various practical applications. !14
机译：摘要：我们介绍了通过反转样品中的极化铁电畴实现的非周期性光学超晶格（AOS）的优化设计。该设计问题属于解决非线性光学中的逆源问题。可以使用模拟退火方法来实现AOS的光学设计。所构造的AOS可以在预定的波长处实现具有相同有效非线性系数的多波长二次谐波产生和耦合的三次谐波产生。仿真表明，与使用斐波那契光学超晶格的谐波相比，所构建的AOS中的谐波生成可以更好地达到预定目标。有效非线性系数与光波在样品中与入射光入射表面的传播距离之间的关系表现出单调递增的行为。显然，这可以推断出，对典型参量过程的每个块的贡献在相长干涉状态下都是彼此相关的。期望这种新的设计方法可以提供一种有效和有用的技术，用于灵活地构造非线性光学材料以实现期望的功能并匹配各种实际应用。 ！14

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