论文标题
Hybrid Co $ \ MATHRM {_2} $ - ti：带有可调脉冲持续时间的蓝宝石激素
Hybrid CO$\mathrm{_2}$-Ti:sapphire laser with tunable pulse duration for mid-infrared-pump terahertz-probe spectroscopy
论文作者
论文摘要
具有强烈的中红外和Terahertz脉冲的超快光激发已成为动态控制材料的新工具。由于大多数实验是用飞秒脉冲激发进行的，因此固体中大多数光诱导现象的典型寿命仅仅具有少量的皮秒。但是，许多科学应用需要更长的驱动脉冲和寿命。在这里，我们描述了一个基于CO $ \ MATHRM {_2} $激光的中型泵 - Terahertz-probe设置，并用10.6 $ \MATHRMμ$ M M MMATHRMμ$ M M M M M M从光学参数放大器发出的脉冲本身，由A Ti：Al $ \ MATHRM _ $ \ MATHRM {$ o;种子CO $ \ MATHRM {_2} $激光的输出产生纳秒持续时间的高功率脉冲，该持续时间与飞秒激光同步。因此，这些脉冲可以在脉冲持续时间内通过将其前后边缘切成频率和后边缘，该脉冲用半导体的镜像被飞秒型种子激光脉冲辐射照射。可变的脉冲长度从5 ps到1.3 ns，并用于中红外泵，Terahertz-probe实验，并用飞秒激光器产生的探针脉冲和电气进行了电气采样。
Ultrafast optical excitation with intense mid-infrared and terahertz pulses has emerged as a new tool to control materials dynamically. As most experiments are performed with femtosecond pulse excitation, typical lifetimes of most light-induced phenomena in solids are of only few picoseconds. Yet, many scientific applications require longer drive pulses and lifetimes. Here, we describe a mid-infrared pump - terahertz-probe setup based on a CO$\mathrm{_2}$ laser seeded with 10.6 $\mathrmμ$m wavelength pulses from an optical parametric amplifier, itself pumped by a Ti:Al$\mathrm{_2}$O$\mathrm{_3}$ laser. The output of the seeded CO$\mathrm{_2}$ laser produces high power pulses of nanosecond duration, which are synchronized to the femtosecond laser. Hence, these pulses can be tuned in pulse duration by slicing their front and back edges with semiconductor-plasma mirrors irradiated by replicas of the femtosecond seed laser pulses. Variable pulse lengths from 5 ps to 1.3 ns are achieved, and used in mid-infrared pump, terahertz-probe experiments with probe pulses generated and electro-optically sampled by the femtosecond laser.
