论文标题
通过在高质量的真空系统中与准平行激光对撞机的四波混合，扩展搜索类似子-EV轴的共振。
Extended search for sub-eV axion-like resonances via four-wave mixing with a quasi-parallel laser collider in a high-quality vacuum system
论文作者
论文摘要
通过将两色脉冲激光聚焦到准vacuum中，通过四波混合搜索了轴突样颗粒的共振状态。允许探测子-EV质量范围的准平行碰撞系统是通过用外轴抛物面镜聚焦的激光场来实现的。 A 0.10 MJ/34 FS Ti：蓝宝石激光脉冲和0.14 MJ/9 NS ND：YAG激光脉冲通过共享通用的光轴并集中在真空系统中，通过时空同步。在$ 3.7 \ times 10^{ - 5} $ pa的真空压力下未观察到明显的四波混合信号，从而通过假设标量和伪尺度场的交换以95％的置信度的水平在0.21 ev低于0.21 ev的质量范围内以95％的置信度来提供耦合质量关系的上限。在此搜索中，实验设置已大大升级，因此光学组件与高质量真空系统的要求兼容，因此可以增加脉冲功率。随着脉冲功率的增加，除了已知的原子四波混合过程外，还出现了一种新型的压力依赖性背景光子。本文显示了这些背景光子的压力依赖性以及如何在搜索中处理它们。
Resonance states of axion-like particles were searched for via four-wave mixing by focusing two-color pulsed lasers into a quasi-vacuum. A quasi-parallel collision system that allows probing of the sub-eV mass range was realized by focusing the combined laser fields with an off-axis parabolic mirror. A 0.10 mJ/34 fs Ti:Sapphire laser pulse and a 0.14 mJ/9 ns Nd:YAG laser pulse were spatiotemporally synchronized by sharing a common optical axis and focused into the vacuum system. No significant four-wave mixing signal was observed at the vacuum pressure of $3.7 \times 10^{-5}$ Pa , thereby providing upper bounds on the coupling-mass relation by assuming exchanges of scalar and pseudoscalar fields at a 95 % confidence level in the mass range below 0.21 eV. For this search, the experimental setup was substantially upgraded so that optical components are compatible with the requirements of the high-quality vacuum system, hence enabling the pulse power to be increased. With the increased pulse power, a new kind of pressure-dependent background photons emerged in addition to the known atomic four-wave mixing process. This paper shows the pressure dependence of these background photons and how to handle them in the search.
