一种用于飞秒时间分辨宽带椭圆偏振光谱和磁光的灵活实验装置。

A flexible experimental setup for femtosecond time-resolved broad-band ellipsometry and magneto-optics.

作者信息

Boschini F, Hedayat H, Piovera C, Dallera C, Gupta A, Carpene E

机构信息

Dipartimento di Fisica, Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, Italy.

Department of Chemistry, University of Alabama, Tuscaloosa, Alabama 35487, USA.

出版信息

Rev Sci Instrum. 2015 Jan;86(1):013909. doi: 10.1063/1.4906756.

DOI:10.1063/1.4906756

PMID:25638099

Abstract

A versatile experimental setup for femtosecond time-resolved ellipsometry and magneto-optical Kerr effect measurements in the visible light range is described. The apparatus is based on the pump-probe technique and combines a broad-band probing beam with an intense near-infrared pump. According to Fresnel scattering matrix formalism, the analysis of the reflected beam at different polarization states of the incident probe light allows one to determine the diagonal and the off-diagonal elements of the dielectric tensor in the investigated sample. Moreover, the pump-probe method permits to study the dynamics of the dielectric response after a short and intense optical excitation. The performance of the experimental apparatus is tested on CrO2 single crystals as a benchmark.

摘要

描述了一种用于可见光范围内飞秒时间分辨椭圆偏振光谱和磁光克尔效应测量的通用实验装置。该装置基于泵浦-探测技术，将宽带探测光束与强近红外泵浦光相结合。根据菲涅耳散射矩阵形式，分析入射探测光不同偏振态下的反射光束，可以确定被研究样品中介电张量的对角元和非对角元。此外，泵浦-探测方法能够研究在短时间强光学激发后介电响应的动力学。以CrO2单晶作为基准对实验装置的性能进行了测试。