近长波红外频率分辨光学选通的十倍带宽相位匹配
Decadal bandwidth phase matching for frequency resolved optical gating from the near to the long wavelength infrared
摘要：
超快激光脉冲使研究极端非线性过程成为可能。然而，这些实验中的许多需要电场的完全表征，这通常需要单独的参数光学过程。随着新光源的中心波长范围不断增加，对适合表征这些不同波长的非线性晶体的需求也在增加。在这里，我们报告使用多晶硒化锌作为一个通用的非线性晶体的频率分辨光学选通表征技术，从近到长波长的红外，能够相位匹配的二次谐波产生和频率产生超过十年的带宽，以及超宽带脉冲，所有这些都是晶体取向和输入偏振无关。由于大多数超快激光源都在这个波长范围内，这项工作展示了一种大大简化的方法，可以在中长波长红外线中进行超快脉冲表征。
英文摘要：
Ultra-fast laser pulses have made possible the study of extreme nonlinear processes. Many of these experiments however require a full characterization of the electric field, which typically requires a separate parametric optical process. As the central wavelength range of new sources continues to increase so too does the need for nonlinear crystals suited for characterizing these differing wavelengths. Here we report on the use of polycrystalline Zinc Selenide as a universal nonlinear crystal in the frequency resolved optical gating characterization technique from the near to long-wavelength infrared, capable of phase matching second-harmonic generation and sum-frequency generation over a decade of bandwidth, as well as ultra-broadband pulses, all of which being crystal orientation and input polarization independent. With the majority of ultra-fast laser sources being in this span of wavelengths, this work demonstrates a greatly simplified approach towards ultra-fast pulse characterization in the mid to long-wavelength infrared.
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