Multi-dimensional spectroscopy with cascade four-wave mixing in the extreme ultraviolet

Hung Dai Nguyen; Khuong Ba Dinh; Lap Van Dao

doi:10.1117/12.2566314

20 August 2020 Multi-dimensional spectroscopy with cascade four-wave mixing in the extreme ultraviolet

Hung Dai Nguyen, Khuong Ba Dinh, Lap Van Dao

Proceedings Volume 11497, Ultrafast Nonlinear Imaging and Spectroscopy VIII; 114970F (2020) https://doi.org/10.1117/12.2566314
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Using two multiple-cycle optical pulses with incommensurate frequencies (e.g., at wavelengths 1400 nm and 800 nm) in a collinear configuration, a cascaded background-free four-wave mixing EUV field can be realized because the EUV pulse produced by phase-matched high order harmonic generation in combination with the other two optical pulses creates a third-order nonlinear polarisation which drives a phase-matched four-wave mixing process along the propagating direction. The four-wave mixing emission can be manipulated by varying the delay of the second optical pulse. The phase-matching of the four-wave mixing process together with the relatively long interaction path combine to produce a strong output signal which leads to an enhanced signal-noise ratio of the Fourier-transformed signal used to obtain the two-dimensional cross correlation spectrum. Some key features of this two-dimensional spectroscopy, such as the on-axis and off-axis peaks, can lead to the determination of interaction pathways of real dipole-allowed transitions and virtual transitions in the EUV.

Conference Presentation

Citation Download Citation

Hung Dai Nguyen, Khuong Ba Dinh, and Lap Van Dao "Multi-dimensional spectroscopy with cascade four-wave mixing in the extreme ultraviolet", Proc. SPIE 11497, Ultrafast Nonlinear Imaging and Spectroscopy VIII, 114970F (20 August 2020); https://doi.org/10.1117/12.2566314

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