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Main Authors:	Xie, Tao, Liu, YangMing, Zhu, WenXin, Guo, XueShi, Jin, RuiBo
Format:	Preprint
Published:	2026
Subjects:	Optics
Online Access:	https://arxiv.org/abs/2603.04927
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author	Xie, Tao Liu, YangMing Zhu, WenXin Guo, XueShi Jin, RuiBo
author_facet	Xie, Tao Liu, YangMing Zhu, WenXin Guo, XueShi Jin, RuiBo
contents	Nonlinear Raman-Nath diffraction (NRND) and nonlinear Cherenkov radiation (NCR) are significant nonlinear diffraction phenomena in optics. Previous studies have primarily focused on NRND and NCR in uniaxial crystals, particularly in periodically poled lithium niobate (PPLN) crystals. However, research on these phenomena in biaxial crystals, such as periodically poled potassium titanyl phosphate (PPKTP), has been limited, and the study of NCR in PPKTP has not yet been undertaken.In this work, we experimentally investigated NRND and NCR phenomena in PPKTP crystals under varying incident angles, pump polarizations, poling periods, and crystal temperatures. Our findings indicate that PPKTP exhibits over ten times greater thermal stability compared to PPLN. This high thermal stability is promising for applications in parallel optical computing, as it helps reduce optical mode deviations and minimize bit error rates.
format	Preprint
id	arxiv_https___arxiv_org_abs_2603_04927
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Thermal stable nonlinear Raman-Nath diffraction and Cherenkov radiation in PPKTP crystals Xie, Tao Liu, YangMing Zhu, WenXin Guo, XueShi Jin, RuiBo Optics Nonlinear Raman-Nath diffraction (NRND) and nonlinear Cherenkov radiation (NCR) are significant nonlinear diffraction phenomena in optics. Previous studies have primarily focused on NRND and NCR in uniaxial crystals, particularly in periodically poled lithium niobate (PPLN) crystals. However, research on these phenomena in biaxial crystals, such as periodically poled potassium titanyl phosphate (PPKTP), has been limited, and the study of NCR in PPKTP has not yet been undertaken.In this work, we experimentally investigated NRND and NCR phenomena in PPKTP crystals under varying incident angles, pump polarizations, poling periods, and crystal temperatures. Our findings indicate that PPKTP exhibits over ten times greater thermal stability compared to PPLN. This high thermal stability is promising for applications in parallel optical computing, as it helps reduce optical mode deviations and minimize bit error rates.
title	Thermal stable nonlinear Raman-Nath diffraction and Cherenkov radiation in PPKTP crystals
topic	Optics
url	https://arxiv.org/abs/2603.04927

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