Yoshitomi Dai, Zhou Xiangyu, Kobayashi Yohei, Takada Hideyuki, Torizuka Kenji
National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba 305-8568, Japan.
Opt Express. 2010 Dec 6;18(25):26027-36. doi: 10.1364/OE.18.026027.
We report long-term stable passive synchronization of a femtosecond Yb-doped fiber chirped-pulse amplifier (CPA) with a mode-locked Ti:sapphire laser for pump-seed synchronization of an optical parametric chirped-pulse amplification (OPCPA) system. The fiber CPA system delivers pulses with a wavelength of 1035 nm, energy of 50 µJ, and duration of 690 fs at a repetition rate of 0.4 MHz. The seed fiber oscillator is passively synchronized with a mode-locked Ti:sapphire laser by injection of the Ti:sapphire laser pulses into the cavity of the fiber oscillator. The second harmonic (SH) output with a wavelength of 518 nm, energy of 18 µJ, and duration of 1.2 ps was prepared for the OPCPA pump. The measured timing jitter between the pump (fiber SH) and the seed (Ti:sapphire) was 42 ± 14 fs, while the jitter between two oscillator outputs was 1.4 ± 0.5 fs. The robust synchronization technique allows long-term stable operation over 8 h.
我们报道了一种飞秒掺镱光纤啁啾脉冲放大器（CPA）与锁模钛宝石激光器的长期稳定被动同步，用于光参量啁啾脉冲放大（OPCPA）系统的泵浦 - 种子同步。光纤CPA系统在0.4 MHz的重复频率下输出波长为1035 nm、能量为50 μJ、脉宽为690 fs的脉冲。通过将钛宝石激光脉冲注入光纤振荡器的腔中，种子光纤振荡器与锁模钛宝石激光器实现被动同步。为OPCPA泵浦准备了波长为518 nm、能量为18 μJ、脉宽为1.2 ps的二次谐波（SH）输出。测量得到泵浦（光纤SH）和种子（钛宝石）之间的定时抖动为42±14 fs，而两个振荡器输出之间的抖动为1.4±0.5 fs。这种稳健的同步技术允许在8小时以上进行长期稳定运行。
