Cascade random-quasi-phase-matched harmonic generation in polycrystalline ZnSe

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Title
Cascade random-quasi-phase-matched harmonic generation in polycrystalline ZnSe
Author(s)
Kupfer, R; Quevedo, HJ; Smith, HL; Lisi, LA; Tiwari, G; Richmond, CG; Bowers, BB; Fang, L; Hegelich, BM
Publication Date
2018-12
Journal
JOURNAL OF APPLIED PHYSICS, v.124, no.24, pp.243102 -
Publisher
AMER INST PHYSICS
Abstract
We experimentally and numerically investigated the cascade random-quasi-phase-matched harmonic generation in polycrystalline zinc selenide with tightly focused mid-infrared nanosecond laser pulses. We observed a sharp transition between two distinct intensity scaling regimes as a function of pump energy from sub I-N to super I-N, where I is the pump intensity and N is the harmonic order. To gain an understanding of the observations of this complex nonlinear process, we carried out simulations of the coupled three-wave mixing equations with random grain sizes and orientations. We found a grain size dependence of the effective phase-matching condition, suggesting that manipulation of grain size can be an effective pathway to phase-matching optimization. This approach may provide a framework for effectively enhancing high harmonic generation and other wave mixing effects in polycrystalline materials. (C) Published by AIP Publishing
URI
http://pr.ibs.re.kr/handle/8788114/5368
ISSN
0021-8979
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > Journal Papers (저널논문)
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