通过laser频率调制校准LIGO位移执行器
Calibration of the LIGO displacement actuators via laser frequency modulation
摘要：
我们提出了一种频率调制技术校准的位移致动器的LIGO 4公里长的干涉引力波探测器。通过将干涉仪锁定在单臂配置中，我们调制激光的频率，从而产生有效长度变化，我们通过测量频率调制的幅度来校准该有效长度变化。通过同时驱动控制臂腔长度的音圈致动器，我们校准了音圈致动系数，估计1-sigma不确定性小于1%。该技术使得能够使用与其他校准方法中所采用的位移基准完全不同的位移基准进行无力单步致动器校准。
英文摘要：
We present a frequency modulation technique for calibration of the displacement actuators of the LIGO 4-km-long interferometric gravitational-wave detectors. With the interferometer locked in a single-arm configuration, we modulate the frequency of the laser light, creating an effective length variation that we calibrate by measuring the amplitude of the frequency modulation. By simultaneously driving the voice coil actuators that control the length of the arm cavity, we calibrate the voice coil actuation coefficient with an estimated 1-sigma uncertainty of less than one percent. This technique enables a force-free, single-step actuator calibration using a displacement fiducial that is fundamentally different from those employed in other calibration methods.
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