Parametric down-conversion with nonideal and random quasi-phase-matching
Chun-Yao Yang1*, Chun-Lin1, Wei-Min Su1, Chih-Sung Chuu1, C. Liljestrand2, C. Canalias2
1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
2Department of Applied Physics, Royal Institute of Technology, Roslagstullsbacken 21, 10691 Stockholm, Sweden
* presenting author:Chun-Yao Yang,
We describe theoretical and experimental studies of parametric down-conversion with quasi-phase-matching (QPM) subject to nonideal duty cycle and random phase error. Emergence of noncritically birefringent-phase-matched biphotons, with a spectrum dependent on the nonidealities and randomness, is observed in a PPKTP crystal of short periodicity. This work may provide new perspectives for biphoton engineering with QPM.

Keywords: Parametric down-conversion, random quasi-phase-matching, biphoton, a PPKTP crystal of short periodicity