High efficiency frequency conversion based on cascaded processes under large phase mismatching between some interacting pulses

Boyuan Zheng; Vyacheslav A. Trofimov; Dmitry M. Kharitonov; Mikhail V. Fedotov; Yongqiang Yang; Di Wang

doi:10.1117/12.2691297

12 March 2024 High efficiency frequency conversion based on cascaded processes under large phase mismatching between some interacting pulses

Boyuan Zheng, Vyacheslav A. Trofimov, Dmitry M. Kharitonov, Mikhail V. Fedotov, Yongqiang Yang, Di Wang

Author Affiliations +

Proceedings Volume 12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII; 128690Q (2024) https://doi.org/10.1117/12.2691297
Event: SPIE LASE, 2024, San Francisco, California, United States

Conference Poster

Abstract

We study the frequency up- and down-conversion based on the cascaded process which accompanies large phase mismatching between fundamental and intermediate waves. So, for example, we propose using the cascaded Second-Harmonic Generation (SHG) to implement the frequency conversion process, which is similar to that occurring in a medium with cubic susceptibility. At phase matching between the fundamental wave and the third-harmonic wave, Third Harmonic Generation (THG) occurs with high efficiency (94.5%). We demonstrate that the cascaded process may also influence negatively on the frequency conversion processes. SHG in a medium with combined quadratic and cubic nonlinear response accounting for weak THG at large phase mismatching demonstrates that in some cases, the second harmonic intensity evolution is different, whether we take into account of weak THG process or not. So, then the intensity at doubled frequency may be much lower in certain sections in comparison with those without accounting for THG. We study such an influence of weak THG both for pulses with long duration by developing analytical approach and for short pulses based on computer simulation.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Boyuan Zheng, Vyacheslav A. Trofimov, Dmitry M. Kharitonov, Mikhail V. Fedotov, Yongqiang Yang, and Di Wang "High efficiency frequency conversion based on cascaded processes under large phase mismatching between some interacting pulses", Proc. SPIE 12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, 128690Q (12 March 2024); https://doi.org/10.1117/12.2691297

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