预电离稀有气体中的相位匹配高次谐波产生
Phase-matched high-order harmonic generation in pre-ionized noble gases
AI总结：
本文提出利用弱毛细管放电预电离气体以改善长中性气体靶中高次谐波产生的相位匹配，并在氩气和氪气中首次实验验证，显著提高了谐波产生效率。
摘要：
在长中性气体靶中高效产生高次谐波的主要困难之一在于达到相位匹配条件。其中一个问题是，由于等离子体散焦，驱动激光无法使介质充分电离。我们提出了一种通过使用弱毛细管放电预电离气体来改善相位匹配的方法。我们首次在氩气和氪气中，通过800纳米飞秒激光在吸收极限的极紫外（XUV）产生中演示了这一机制。我们的方法的相位失配控制能力通过解析模型和完整产生过程的数值模拟得到了证实。我们的方法能够显著提高谐波产生的效率，为这些短波长紧凑光源在光子饥饿型应用中的应用铺平了道路。
英文摘要：
One of the main difficulties to efficiently generating high-order harmonics in long neutral-gas targets is to reach the phase-matching conditions. One issue is that the medium cannot be sufficiently ionized by the driving laser due to plasma defocusing. We propose a method to improve the phase-matching by pre-ionizing the gas using a weak capillary discharge. We have demonstrated this mechanism, for the first time, in absorption-limited XUV generation by an 800 nm femtosecond laser in argon and krypton. The phase-mismatch control ability of our method is confirmed by an analytical model and numerical simulation of the complete generation process. Our method allows increasing the efficiency of the harmonic generation significantly, paving the way towards photon-hungry applications of these short-wavelength compact sources.
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