This paper presents a second harmonic assisted spectrally resolved interferometric technique that can overcome the limited spectral resolution of commercially available spectrometers in the mid-infrared. The discussed scheme was validated by measuring the group delay of several well-known and frequently used materials. Our main motivation was to characterize the spectral phase shift of newly designed and manufactured dispersive mirrors to be used for mid-infrared (MIR) post-compression. These mirrors were successfully implemented in the post-compression stage of our MIR laser system, where pulse duration was shortened below two optical cycles and the pulse peak power increased by 30.3% compared to the original output.

本文提出了一种二次谐波辅助光谱分辨干涉测量技术，该技术可以克服市售光谱仪在中红外光谱分辨率有限的问题。通过测量几种众所周知和常用材料的群延迟来验证所讨论的方案。我们的主要动机是表征新设计和制造的用于中红外 (MIR) 后压缩的色散镜的光谱相移。这些反射镜在我们的 MIR 激光系统的后压缩阶段成功实施，其中脉冲持续时间缩短到两个光学周期以下，脉冲峰值功率与原始输出相比增加了 30.3%。