Cross-phase modulation in two-dimensional spectroscopy

Author:

Cai Mao-Rui1ORCID,Zhang Xue1,Cheng Zi-Qian1,Yan Teng-Fei2,Dong Hui1

Affiliation:

1. Graduate School of China Academy of Engineering Physics

2. Shanghai University

Abstract

Developing from transient absorption (TA) spectroscopy, two-dimensional (2D) spectroscopy with pump-probe geometry has emerged as a versatile approach for alleviating the difficulty in implementing 2D spectroscopy with other geometries. However, the presence of cross-phase modulation (XPM) in TA spectroscopy introduces significant spectral distortions, particularly when the pump and probe pulses overlap. We demonstrate that this phenomenon is extended to the 2D spectroscopy with pump-probe geometry and the XPM is induced by the interference of the two pump pulses. We present the oscillatory behavior of XPM in the 2D spectrum and its displacement with respect to the waiting time delay through both experimental measurements and numerical simulations. Additionally, we explore the influence of probe pulse chirp on XPM and discover that by compressing the chirp, the impact of XPM on the desired signal can be reduced.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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