论文标题
预电源降低气体中的相匹配的高阶谐波产生
Phase-matched high-order harmonic generation in pre-ionized noble gases
论文作者
论文摘要
在长中性气体目标中有效产生高阶谐波的主要困难之一是达到相匹配条件。一个问题是，由于等离子体散热，培养激光器无法充分离子。我们提出了一种通过使用弱毛细血管排放来预取气体来改善相匹配的方法。我们首次通过800 nm的飞秒激光在Argon和Kkrypton中通过800 nm的飞秒激光来证明了这种机制。我们方法的相位不匹配控制能力通过分析模型和完整生成过程的数值模拟确认。我们的方法允许显着提高谐波产生的效率，从而铺平了这些短波长紧凑型源的渴望光子应用的道路。
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.
