Quantum control by using an attosecond pulse train with a variable pulse period

研制了一种波长为1.2 ~ 2.1 μm的新型宽带红外激光脉冲源。该激光源可以产生具有高次谐波产生的孤立阿秒脉冲，以观察和控制原子和分子中的量子态，尽管激光系统有待改进。利用已有的12 fs Ti：蓝宝石激光器谐波束流线进行了初步研究，揭示了D_<2+>/H_<2+>分子绝热势产生的核波包（WP）在20 fs以下的动力学特性。这是WP第一次用低于10秒的极紫外脉冲泵浦，并用真空紫外脉冲探测。

We have developed a novel broadband infrared laser pulse source, the wavelength of which spans form 1.2μm to 2.1 μm. This laser source can potentially generate an isolated attosecond pulse with the high-order harmonic generation to observe and control quantum states in atoms and molecules, even though the laser system should be improved. The preliminary study by using an existing harmonic beam line with a 12-fs Ti:sapphaire laser revealed the sub-20 fs dynamics of the nuclear wave-packet (WP) generated on the adiabatic potential of D_<2+>/H_<2+> molecule. This was the first observation the WP pumped with a sub-10 fs extreme ultraviolet pulse and probed with a vacuum ultraviolet pulse.