Broadband second harmonic generation of counter-propagating ultrashort pulses

Counter-propagating ultrafast pulses can disrupt the phase of harmonic generation, and offer a means to achieve quasi-phase matching in processes like high-order harmonic generation. Optimizing this process requires accurate modeling. Using second harmonic generation (SHG) as a simpler and more acce...

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Bibliographic Details
Published inOptics express Vol. 30; no. 11; pp. 17922 - 17935
Main Authors Lytle, Amy L., Dyke, Eric, Novella, Julia, Branch, Thomas, Gagnon, Etienne
Format Journal Article
LanguageEnglish
Published 23.05.2022
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Summary:Counter-propagating ultrafast pulses can disrupt the phase of harmonic generation, and offer a means to achieve quasi-phase matching in processes like high-order harmonic generation. Optimizing this process requires accurate modeling. Using second harmonic generation (SHG) as a simpler and more accessible proxy, we compare the results of two numerical simulations to experimental measurements of SHG with counter-propagating pulses. The first follows previous theoretical work in assuming a quasi-CW pulse and solving the nonlinear wave equation in the time-domain. However, we find that adapting a frequency-domain model to account for the broadband nature of ultrafast pulses better reproduces the salient features we observe in our experimental results.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.458570