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首页> 外文期刊>Review of Scientific Instruments >Synchronizing femtosecond laser with x-ray synchrotron operating at arbitrarily different frequencies
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Synchronizing femtosecond laser with x-ray synchrotron operating at arbitrarily different frequencies

机译：飞秒激光与X射线同步加速器以任意不同的频率进行同步

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摘要

The ability to synchronize a femtosecond laser to x-ray pulses is crucial for performing ultrafast time-resolved x-ray scattering experiments at synchrotrons. Conventionally, the task has been achieved by locking a harmonic frequency of the laser oscillator to the storage ring master radio-frequency (RF). However, when the frequency mismatch between the two sources cannot be compensated by small adjustments to the laser cavity length, synchronization to a harmonic frequency requires modifying the optical components of the laser system. We demonstrate a novel synchronization scheme, which is a flexible alternative for synchronizing these two sources operating at arbitrarily different frequencies. First, we find the greatest common divisor (GCD) of the two frequencies that is still within the limited tuning range of the laser cavity length. The GCD is generated by dividing down from the storage ring RF, and is separately multiplied up to provide a feedback signal for synchronizing the laser cavity. Unique to our scheme, the GCD also serves as a harmonic RF source for the laser amplifier such that only laser oscillator pulses at fixed integer multiples of the storage ring RF are selected for amplification and delivery to experiments. Our method is implemented at the Photon Test Facility beamline of Pohang Light Source where timing-jitter less than 4 ps (r.m.s.) is measured using a new shot-to-shot method.
机译：飞秒激光与X射线脉冲同步的能力对于在同步加速器上进行超快的时间分辨X射线散射实验至关重要。常规上，通过将激光振荡器的谐波频率锁定到存储环主射频（RF）来完成任务。但是，当两个光源之间的频率不匹配无法通过对激光腔长度的小调整来补偿时，与谐波频率的同步需要修改激光系统的光学组件。我们演示了一种新颖的同步方案，该方案是用于以任意不同的频率同步这两个源的灵活替代方案。首先，我们发现两个频率中的最大公约数（GCD）仍在激光腔长度的有限调谐范围内。 GCD是通过从存储环RF向下划分而生成的，并分别相乘以提供用于同步激光腔的反馈信号。对于我们的方案而言，GCD独有，它还可以用作激光放大器的谐波RF源，从而仅选择处于存储环RF固定整数倍的激光振荡器脉冲进行放大并传递到实验中。我们的方法是在浦项光源的光子测试设备光束线上实现的，该位置使用新的逐次拍摄方法测量了小于4 ps（r.m.s.）的定时抖动。

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