kHz 脉冲分子束的产生及其在强场原子分子物理实验中的应用

采用悬臂压电脉冲阀, 制备出最高重复频率达到3 kHz 的脉冲分子束。通过测量氮气分子束在飞秒激光作用下隧道电离生成的N2 +(B-X)荧光光谱, 对脉冲阀的性能做了表征。这种kHz 脉冲分子束搭配kHz 飞秒激光器, 将推动飞秒强激光驱动的原子分子动力学实验研究。

Generation of kHz Pulsed Molecular Beams and Its Application in Experimental Research of Strong Field Atomic and Molecular Physics

The authors successfully generated pulsed molecular beams with high repetition rate by using a cantilever piezo valve, and the highest repetition rate could reach 3 kHz. The interaction between intense femtosecond laser fields and nitrogen molecular beams were studied, in which the molecular beams were produced by cantilever piezo valve. Strong fluorescence emissions, which could be assigned to N2 +(B-X), were observed. The performance of pulse valve was characterized based on the measurement of the fluorescence emission as a function of the repetition rate and the time delay of the pulsed valve. The results demonstrate that pulsed molecular beams can be generated with high quality and high repetition rate. The combination of such pulsed molecular beams and high-frequency kHz femtosecond lasers will promote the experimental study of molecular dynamics driven by intense femtosecond laser fields.