Coherence properties of a broadband femtosecond mid-IR optical parametric oscillator operating at degeneracy
Coherence properties of a broadband femtosecond mid-IR optical parametric oscillator operating at degeneracy
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DOI：
10.1364/oe.20.007255
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发表时间：
2012-03-26
期刊：
影响因子：
3.8
通讯作者：
Vodopyanov, Konstantin L.
中科院分区：
文献类型：
--
作者：
Marandi, Alireza;Leindecker, Nick C.;Vodopyanov, Konstantin L.
研究了一种能产生以飞秒抽运激光的次谐波（3120 nm）为中心的2/3倍频程光谱的χ（2）光学参量振荡器（OPO）的相干特性。我们的方法包括干涉两个相同的，但独立的OPO的输出由同一激光泵浦。我们表明，这两个OPO表现出稳定的空间和时间的干扰，并相互锁定的频率和相位。通过观察两个OPO之间的集体外差拍频信号，我们表明，可以确定性地选择，通过腔长调整，对应于两组模式之间的两个频率状态相对于彼此移动了一半的激光脉冲重复率。此外，我们观察到，两个相反的相位状态的存在，一个已知的参数驱动n = 2的亚谐波振荡器的共同特征，揭示了自己在我们的实验作为一个共同的相位，0或π，通过整个约30万纵向模式的集合建立。(C)2012美国光学学会
We study coherence properties of a chi((2)) optical parametric oscillator (OPO), which produces 2/3-octave-wide spectrum centered at the subharmonic (3120 nm) of the femtosecond pump laser. Our method consists of interfering the outputs of two identical, but independent OPOs pumped by the same laser. We demonstrate that the two OPOs show stable spatial and temporal interference and are mutually locked in frequency and in phase. By observing a collective heterodyne beat signal between the two OPOs we show that one can deterministically choose, by cavity length adjustment, between the two frequency states corresponding to the two sets of modes shifted with respect to each other by half of the laser pulse repetition rate. Moreover, we observe that the existence of two opposite phase states, a known common feature of a parametrically driven n = 2 subharmonic oscillator, reveals itself in our experiment as a common phase, 0 or pi, being established through the whole set of some 300 thousand longitudinal modes. (C) 2012 Optical Society of America