Partially deuterated potassium dihydrogen phosphate (DKDP) allows for the optical parametric chirped-pulse amplification of high-energy broadband optical pulses to generate ultrashort, high-peak-power pulses. Modeling and experimental optimization of the noncollinear interaction geometry require the combination of a model for the deuteration-dependent optical indices and knowledge of the deuteration level of the DKDP crystal being used. We study and demonstrate a novel experimental technique that determines the deuteration level of a DKDP crystal consistent with a specific index model, based on the phase-matching angles measured at two wavelengths. Simulations and experiments show that the simple two-wavelength technique allows for consistent results with three different index models, and in particular, for the characterization of four crystals with deuteration levels ranging from 70% to 98%.

中文翻译：

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使用两个波长相位匹配角表征部分氘代KDP晶体

部分氘化磷酸二氢钾（DKDP）可以对高能宽带光脉冲进行光参量chi脉冲放大，以生成超短，高峰值功率脉冲。非共线相互作用几何的建模和实验优化需要结合氘的光学指数模型和所使用的DKDP晶体的氘水平的知识的结合。我们研究并证明了一种新颖的实验技术，该技术基于在两个波长下测得的相位匹配角来确定与特定折射率模型一致的DKDP晶体的氘代水平。仿真和实验表明，简单的两波长技术可以在三种不同的索引模型中获得一致的结果，特别是，