周期量级长波长光源,极端非线性光学以及阿秒科学

Long Wavelength Few-cycle Sources,Extreme Nonlinear Optics and Attoscience

介绍了长波长光源的发展以及其在非线性光学以及强场物理方面的应用。长波长光源的产生以各种方式推动了强场和阿秒物理学的发展:在隧穿机制下光电离的研究,用于X射线成像的飞秒量级KeV辐射源的产生。考虑到这些前景,如何产生高能量、长波长以及周期量级的光源是一件非常有挑战性的工作。在过去几年,一直致力于产生和发展波长在2～3μm、载波相位稳定,周期量级的强光源,其重复频率从几千赫兹到百千赫兹。重点介绍这些光源的发展,以及脉冲相关测量的方法。此外,以某一种光源作为例子来介绍其在多倍频超连续谱的产生,分子的电离动力学以及阿秒光源生产等方面的应用。

The talk will highlight some of our activities in the development of long wavelength light sources and applications to nonlinear optics and strong field physics. Strong field and attosecond physics benefit from long wavelength drivers in nu merous ways. Photoionization studies can be carried out unambiguously in the tunneling regime, generation of femtosecond duration keV radiation is in reach for X-ray imaging, and recollision imaging would have sufficiently high resolution due to the kinetic energy of the returning electron. With such prospects in mind, the challenging task is to generate intense light pulses beyond the near-IR at sufficient high average power with few-cycle duration and ideally electric waveform repeatability. We have, over the last years, developed such sources of intense light at 2 and 3 micron center wavelength which are carrier-to envelope phase stable, pulse durations are in the few-cycle regime, and repetition rates in the kHz to hundreds of kHz. The presentation will highlight some source developments, detail issues in pulse measurement and examples will be given from first applications in generation of multi-octave supercontinua, to ionization dynamics in molecules with a reaction microscope, and attosecond pulse generation.