标题： 高对比度的啁啾脉冲放大技术通过带内噪声滤波实现 显示英文标题

标题： High-Contrast Chirped-Pulse Amplification Enabled by In-Band Noise Filtering

摘要： 用于产生超强光脉冲的激光器正在开发中，用于高场和高能量密度物理实验，以及粒子加速等应用。 对于未来可能只能想象的研究，如等离子体的量子电动力学和固体靶的孤立阿托秒脉冲生成，正在考虑进一步提高功率。 在所有这些领域，产生高对比度的脉冲至关重要，以确保主脉冲到达之前不会在靶材中产生预等离子体。 然而，在高增益放大中不可避免地存在噪声，并以伴随由啁啾脉冲放大（CPA）产生的脉冲的背景光形式表现出来。 在这里，我们介绍了一种基于空间-频谱耦合的线性滤波技术，这是首次实现对放大脉冲的带内滤波。 实验表明，在光学参量啁啾脉冲放大（OPCPA）中对比度提高了约40倍，并为扩展到更高性能奠定了基础。 该方法的简单性、高效性以及与现有短脉冲生成技术的直接兼容性，将使空间-频谱滤波在超快光学和时间分辨光谱学的广泛应用中具有吸引力，并可能在降噪方面开辟新的方向。 显示英文摘要

摘要： Lasers that generate ultra-intense light pulses are under development for experiments in high-field and high-energy-density physics, as well as for applications such as particle acceleration. Extensions to even higher powers are being considered for future investigations that can only be imagined today, such as the quantum electrodynamics of plasmas and isolated attosecond-pulse generation with solid targets. For all of these areas, it is vital to produce high-contrast pulses, so that no pre-plasma is created in the target before the arrival of the main pulse. However, noise is unavoidable in high-gain amplification, and is manifested in the form of background light that accompanies pulses generated by chirped-pulse amplification (CPA). Here, we introduce a linear filtering technique based on spatio-spectral coupling, which allows in-band filtering of amplified pulses for the first time. Experiments demonstrate approximately 40 times contrast enhancement in optical parametric chirped-pulse amplification (OPCPA) and provide a foundation for scaling to much higher performance. The simplicity, efficiency, and direct compatibility with existing techniques for short-pulse generation will make spatio-spectral filtering attractive to a wide range of applications in ultrafast optics and time-resolved spectroscopy, and may open new directions in noise reduction.