摘要
We present a theoretical and experimental study on the bandwidth of parametric down-converted photons generated from periodically poled lithium niobate(PPLN)crystal pumped by a pulsed laser.By comparison of crystals with different lengths and pump beams of different bandwidths,we demonstrate that the bandwidth of down-converted photons will increase for a broader bandwidth of pump pulse and decrease for a longer crystal,but the influence of crystal length will become weaker along with increase of both crystal length and pump pulse bandwidth.Especially under the conditions of our experiment,the bandwidth almost remains unchanged for longer crystals when pumped by a femtosecond laser.This may be helpful for schemes in which pulsed lasers are used to pump PPLN crystals.
作者
方彬
柳必恒
黄运锋
史保森
郭光灿
FANG Bin;LIU Bi-Heng;HUANG Yun-Feng;SHI Bao-Sen;GUO Guang-Can(Key Lab of Quantum Information,University of Science and Technology of China,Hefei 230026)
基金
by the National Basic Research Program of China under Grant No 2006CB921907
the National Natural Science Foundation of China under Grant No 10774139
the Innovation Funds from Chinese Academy of Sciences
the Program for New Century Excellent Talents in University
the Foundation for Author of National Excellent Doctoral Dissertation of China under Grant No 200729
the Fundamental Research Funds for the Central Universities.
