Parametric Down-Conversion with the Lateral Emission of Idler Photons from the Nonlinear Interaction Region

IF 1.1 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2026-10-01 DOI:10.1134/S0021364026607724

G. Kh. Kitaeva, A. V. Osipenkov

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Abstract

A method has been developed to analyze noncollinear schemes of highly nondegenerate parametric down-conversion, taking into account the transverse limitation of the pump region such that low-frequency idler photons leave the nonlinear interaction region before signal photons, crossing the boundaries of the pump beam or the side of a nonlinear crystal. General expressions have been obtained for the second and fourth moments of the fields in schemes with losses of idler photons generated under spatial phase matching conditions at various angles to the pump propagation direction. It has been shown that the effects of leakage of idler photons through the side with increasing scattering angle lead to an overall decrease in the numbers of photons detected in the signal and idler channels. A counterintuitive result has been obtained, indicating that the considered loss mechanism can lead to a significant increase in the biphoton correlation function, determined not only by a decrease in the total number of generated photons, but also by the ratio of the projections of the idler and signal wave vectors on the pump direction.

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非线性相互作用区惰光子侧向发射的参量下转换

本文提出了一种分析高度非简并参数下转换的非线性共线方案的方法，该方法考虑到泵浦区的横向限制，使得低频空闲光子在信号光子之前离开非线性相互作用区，越过泵浦束的边界或非线性晶体的侧面。得到了在空间相位匹配条件下产生的与泵浦传播方向不同角度的空闲光子损失方案的第二矩和第四矩的一般表达式。结果表明，随着散射角的增加，空闲光子从侧面泄漏的影响会导致信号和空闲通道中检测到的光子总数减少。得到了一个反直觉的结果，表明所考虑的损耗机制可以导致双光子相关函数的显著增加，这不仅由产生光子总数的减少决定，而且由闲散波矢量和信号波矢量在泵浦方向上的投影之比决定。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.