用于一氯化铝光谱学的低占空比脉冲紫外技术
Low Duty Cycle Pulsed UV Technique for Spectroscopy of Aluminum Monochloride
AI总结：
本文提出通过降低紫外光占空比来减少二次谐波腔光学损伤的技术，并利用FPGA控制腔快速调谐，在AlCl分子束实验中验证了其测量同位素位移的有效性。
摘要：
我们提出一种新技术，以在采用二次谐波产生腔的实验中尽量减少紫外光引起的损伤。该方法的核心原理是尽可能降低紫外光的占空比，从而延长所用光学元件的寿命。低占空比通过在实验循环中使用紫外光的短时间内将腔快速扫入共振状态，而在其他时间将其调至非共振状态来实现。腔所需的快速扫频和长度稳定控制由基于FPGA的STEMlab平台实现。我们通过在脉冲分子束实验中测量AlCl在261.5 nm处电子跃迁（$X^1Σ\leftarrow A^1Π$）的同位素位移，证明了该方法的实用性。
英文摘要：
We present a novel technique to minimize UV-induced damage in experiments that employ second-harmonic generation cavities. The principle of our approach is to reduce the duty cycle of the UV light as much as possible to prolong the lifetime of the used optics. The low duty cycle is achieved by ramping the cavity into resonance for a short time during the experimental cycle when the light is used and tuning it to an off-resonant state otherwise. The necessary fast ramp and length-stabilization control of the cavity is implemented with the FPGA-based STEMlab platform. We demonstrate the utility of this method by measuring the isotope shift of the electronic transition ($X^1Σ\leftarrow A^1Π$) in AlCl at 261.5 nm in a pulsed molecular beam experiment.
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