氮气射流中重复频率为100 MHz的Laser驱动荧光发射
Laser Driven Fluorescence Emission in a Nitrogen Gas Jet at 100 MHz Repetition Rate
摘要：
我们报道了在氮气射流中由重复频率为100 MHz、中心波长为1040 nm的飞秒激光脉冲驱动的荧光发射。该实验是在飞秒增强腔与高重复频率激光耦合条件下进行的。与先前在低重复率下用氮气射流观察到的391 nm辐射但337 nm发射缺失相比，在我们的实验中，337 nm发射比391 nm发射强3倍。通过研究辐射强度对氮气流量和泵浦脉冲偏振的依赖性，可以得到N2（C3-u）三重态激发态的形成机制，即，研究了337 nm发射的上能级。我们将主要的激发过程归结为非弹性碰撞激发过程，排除了解离复合作为主要激发途径的可能性。我们的实验条件下产生的稳态等离子体的作用进行了讨论。
英文摘要：
We report the fluorescence emission which is driven by femtosecond laser pulses with a repetition rate of 100 MHz and a center wavelength of 1040 nm in a nitrogen gas jet. The experiment is performed in a femtosecond enhancement cavity coupled with high repetition rate laser for the first time to the best of our knowledge. In contrast to previous observation at low repetition rate with a nitrogen gas jet, where the 391 nm radiation was observed but the 337 nm emission was missing, the 337 nm emission is 3 times stronger than the 391 nm emission in our experiment. By examining the dependence of the radiation intensity on the flow rate of the nitrogen gas and the polarization of the pump pulse, the formation mechanism of the N2(C3Πu) triplet excited state, i.e., the upper state of the 337 nm emission, is investigated. We attribute the main excitation process to the inelastic collision excitation process, and exclude the possibility of the dissociative recombination as the dominate pathway. The role of the steady state plasma that is generated under our experimental conditions is also discussed.
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