Controllable transitions among phase-matching conditions in a single nonlinear crystal  

作　　者：曾梓琦 尤世欣 杨子祥 袁晨智 由成龙 金锐博 Ziqi Zeng;Shixin You;Zixiang Yang;Chenzhi Yuan;Chenglong You;Ruibo Jin(Hubei Key Laboratory of Optical Information and Pattern Recognition,Wuhan Institute of Technology,Wuhan 430205,China;Quantum Photonics Laboratory,Department of Physics and Astronomy,Louisiana State University,Baton Rouge,Louisiana 70803,USA)

机构地区：[1]Hubei Key Laboratory of Optical Information and Pattern Recognition,Wuhan Institute of Technology,Wuhan 430205,China [2]Quantum Photonics Laboratory,Department of Physics and Astronomy,Louisiana State University,Baton Rouge,Louisiana 70803,USA

出　　处：《Chinese Optics Letters》2024年第2期141-147,共7页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.12074299,11704290,and 92365106);the Guangdong Provincial Key Laboratory(No.GKLQSE202102);the Natural Science Foundation of Hubei Province(2022CFA039)。

摘　　要：Entangled photon pairs are crucial resources for quantum information processing protocols.Via the process of spontaneous parametric downconversion(SPDC),we can generate these photon pairs using bulk nonlinear crystals.Traditionally,the crystal is designed to satisfy a specific type of phase-matching condition.Here,we report controllable transitions among different types of phase matching in a single periodically poled potassium titanyl phosphate crystal.By carefully selecting pump conditions,we can satisfy different phase-matching conditions.This allows us to observe first-order Type-II,fifth-order Type-I,third-order Type-0,and fifth-order Type-II SPDCs.The temperature-dependent spectra of our source were also analyzed in detail.Finally,we discussed the possibility of observing more than nine SPDCs in this crystal.Our work not only deepens the understanding of the physics behind phase-matching conditions,but also offers the potential for a highly versatile entangled biphoton source for quantum information research.

关 键 词：spontaneous parametric downconversion nonlinear crystals phase-matching condition 

分 类 号：O431.2[机械工程—光学工程]