Agnesi A, Carrà L, Dallocchio P, Pirzio F, Reali G, Lodo S, Piccinno G
INFN and Dipartimento di Elettronica dell’Università di Pavia, Via Ferrata 1 - 27100 Pavia, Italy.
Opt Express. 2011 Oct 10;19(21):20316-21. doi: 10.1364/OE.19.020316.
Pulse-picking from a 100-mW cw mode-locked seeder, a hybrid master-oscillator power-amplifier (MOPA) system, based on Nd:YVO4 and Nd:YAG amplifier modules, has been developed, delivering single-pulses of 8.6 ps at 455-MHz repetition-rate, bunched into ~1-μs trains of 50 mJ ("macro-pulses"). The output beam is linearly polarized and nearly diffraction limited up to the maximum macro-pulse repetition-rate of 50 Hz. The single-pulse peak power and the macro-pulse duration and energy are quite suitable for high-energy nonlinear optical applications such as low-threshold synchronously-pumped parametric converters in the mid infrared. The impact on the overall efficiency of saturation distortion of the macro-pulse envelope as well as of amplified spontaneous emission (ASE) is considered. The managing of the envelope distortion compensation and of the ASE suppression by means of fast saturable absorbers is reported.
已开发出一种基于Nd:YVO4和Nd:YAG放大器模块的混合主振荡功率放大器（MOPA）系统，该系统从一个100毫瓦连续波锁模种子源进行脉冲选取，可在455兆赫重复频率下产生8.6皮秒的单脉冲，聚集成约1微秒的50毫焦脉冲串（“宏脉冲”）。输出光束是线偏振的，在高达50赫兹的最大宏脉冲重复频率下几乎是衍射极限的。单脉冲峰值功率以及宏脉冲持续时间和能量非常适合用于高能量非线性光学应用，如中红外低阈值同步泵浦参量转换器。考虑了宏脉冲包络的饱和畸变以及放大自发辐射（ASE）对整体效率的影响。报道了通过快速饱和吸收体对包络畸变补偿和ASE抑制的管理。
