As sensitivities improve and more detectors are added to the global network of gravitational wave observatories, calibration accuracy and precision are becoming increasingly important. Photon calibrators, relying on power-modulated auxiliary laser beams reflecting from suspended interferometer optics, enable continuous calibration by generating displacement fiducials proportional to the modulated laser power. Developments in the propagation of laser power calibration via transfer standards to on-line power sensors monitoring the modulated laser power have enabled generation of length fiducials with improved accuracy. Estimated uncertainties are almost a factor of two smaller than the lowest values previously reported. This is partly due to improvements in methodology that have increased confidence in the results reported. Referencing the laser power calibration standards for each observatory to a single transfer standard enables reducing relative calibration errors between elements of the detector network. Efforts within the national metrology institute community to realize improved laser power sensor calibration accuracy are ongoing.

中文翻译：

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全球引力波探测器网络精度更高的基准位移

随着灵敏度的提高和更多的探测器被添加到全球引力波天文台网络中，校准精度和精度变得越来越重要。光子校准器依靠从悬挂式干涉仪光学器件反射的功率调制辅助激光束，通过生成与调制激光功率成正比的位移基准来实现连续校准。激光功率校准通过传输标准传播到监测调制激光功率的在线功率传感器的发展，使得能够以更高的精度生成长度基准。估计的不确定性几乎比先前报告的最低值小两倍。这部分是由于方法的改进提高了对报告结果的信心。将每个天文台的激光功率校准标准参考单个传输标准可以减少探测器网络元件之间的相对校准误差。国家计量院社区正在努力实现更高的激光功率传感器校准精度。