Anisotropic narrowing of biphoton wave packet distribution in spontaneous parametric down-conversion with biaxial crystal. Issue 3 (6th February 2018)

• Record Type: Journal Article
• Authors: Huo, Guangwen; Zhang, Tongyi; Zhang, Meizhi; Zhu, Haiyan; Zha, Xinwei; Chen, Heng
• Is Part Of: Journal of modern optics. Volume 65:Issue 3(2018)
• Page Start: 298
• Page End: 305
• Publication Date: 2018-02-06
• Subjects: Biphoton wave packet distribution -- biaxial crystals -- spontaneous parametric down-conversion (SPDC) -- anisotropic effects; Optics -- Periodicals; 535
• DOI: 10.1080/09500340.2017.1393568
• Languages: English
• ISSNs: 0950-0340

Abstract

Abstract: We investigate theoretically the strong anisotropy in the wave packet distribution of biphoton pairs generated via spontaneous parametric down-conversion (SPDC) process with biaxial crystals. From the angle relationship in biaxial crystals, we deduce the wave function of type I SPDC by considering the longitudinal detuning under paraxial approximation. Taking BiB3 O6 (BIBO) as an example, we numerically simulate the single-particle and coincidence distributions in two observation planes under the optimum phase-matching scheme. In contrast to uniaxial crystals, a stronger anisotropy effect and a higher entanglement of the photon pair states are obtained, which are attributed to the complex structure of biaxial crystals. These results are important for the generation of highly entangled biphoton pairs, especially for multi-photon pairs generation.