Type-I spontaneous parametric down-conversion with a strongly focused pump

被引：33

作者：

Pires, H. Di Lorenzo ^{[1
]}

Coppens, F. M. G. J. ^{[1
]}

van Exter, M. P. ^{[1
]}

机构：

[1] Leiden Univ, Huygens Lab, NL-2300 RA Leiden, Netherlands

来源：

PHYSICAL REVIEW A | 2011年 / 83卷 / 03期

关键词：

QUANTUM FLUCTUATIONS; AMPLIFICATION;

D O I：

10.1103/PhysRevA.83.033837

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We experimentally study the spatial properties of the field generated by spontaneous parametric down-conversion ( SPDC) when the pump laser beam is strongly focused in the nonlinear crystal. Special attention is paid to classical intensity measurements with a CCD camera. We introduce the concept of a classical equivalent source that replicates all the coherence properties of SPDC light and explains all our experimental results. We show that, in contrast with experiments with a well-collimated pump, here both the phase-matching conditions and the position of the focusing plane determine the measured intensity profiles in the image plane of the crystal. The transition from the near-field regime to the far field is investigated. Measurements of two-photon correlations under strong focusing are also presented and the special features thereof are discussed.

引用

页数：8