中国激光, 2018, 45 (7): 0708001, 网络出版: 2018-09-11
皮秒抽运的参量荧光的时间相干性 下载: 683次
Temporal Coherence of Parametric Fluorescence Pumped by Picosecond Pulses
非线性光学 参量荧光 相干性 光参量产生 nonlinear optics parametric fluorescence coherence optical parametric generation
摘要
在理论和实验上,分析了皮秒激光脉冲抽运所产生的参量荧光的时间相干特性。通过引入二阶复相干度,理论研究了在信号光与闲频光群速度走离存在的条件下,抽运功率和抽运脉宽对参量荧光时间相干性的影响。计算结果表明适当的抽运功率和较短的抽运脉宽是提升参量荧光时间相干性的重要条件,而过高的抽运功率或者较宽的抽运脉宽则会降低参量荧光的时间相干性。利用周期极化铌酸锂晶体,在实验上对理论结果进行了初步的实验验证。
Abstract
Both numerically and experimentally, the temporal coherence of parametric fluorescence pumped by picosecond laser is studied. The influence of pump power and pump pulse width on temporal coherence of parametric fluorescence is investigated using the two-time mutual coherence function in the presence of walk-off between the signal and idle. The numerical simulations show that a suitable pump power and a relatively short pump pulse width are very important to increase the temporal coherence of optical parametric fluorescence while a too high pump power or a relatively long pump pulse width can reduce the temporal coherence. Using the periodically poled lithium niobate crystal, the theoretical result is preliminarily proved experimentally.
周南, 李大为, 崔勇, 徐光, 王韬. 皮秒抽运的参量荧光的时间相干性[J]. 中国激光, 2018, 45(7): 0708001. Nan Zhou, Dawei Li, Yong Cui, Guang Xu, Tao Wang. Temporal Coherence of Parametric Fluorescence Pumped by Picosecond Pulses[J]. Chinese Journal of Lasers, 2018, 45(7): 0708001.