In-situ characterization of the thermal state of resonant optical interferometers via tracking of their higher-order mode resonances
Chris L. Mueller, Paul Fulda, Rana X. Adhikari, Koji Arai, Aidan F. Brooks, Rijuparna Chakraborty, Valery V. Frolov, Peter Fritschel, Eleanor J. King, David B. … 展开作者
Chris L. Mueller, Paul Fulda, Rana X. Adhikari, Koji Arai, Aidan F. Brooks, Rijuparna Chakraborty, Valery V. Frolov, Peter Fritschel, Eleanor J. King, David B. Tanner, Hiroaki Yamamoto, Guido Mueller
Thermal lensing in resonant optical interferometers such as those used for gravitational wave detection is a concern due to the negative impact on control signals and instrument sensitivity. In this paper we describe a method for monitoring the thermal state of such interferometers by probing the higher-order spatial mode resonances of the cavities within them. We demonstrate the use of this technique to measure changes in the Advanced LIGO input mode cleaner cavity geometry as a function of input power, and subsequently infer the optical absorption at the mirror surfaces at the level of 1 ppm per mirror. We also demonstrate the generation of a useful error signal for thermal state of the Advanced LIGO power recycling cavity by continuously tracking the first order spatial mode resonance frequency. Such an error signal could be used as an input to thermal compensation systems to maintain the interferometer cavity geometries in the presence of transients in circulating light power levels, thereby maintaining optimal sensitivity and maximizing the duty-cycle of the detectors.
Experimental investigation of a control scheme for a zero-detuning resonant sideband extraction interferometer for next-generation gravitational-wave detectors
In situ substrate birefringence characterization in gravitational wave detectors using a heterodyne polarimetry method
Cardiff University（卡迪夫大学）；The University of Tokyo（东京大学）；University of Birmingham（伯明翰大学）；Nikhef, National Institute for Subatomic Physics（荷兰国家亚原子物理研究所）；University of Glasgow（格拉斯哥大学）；Universit‘ a di Trento（特伦托大学）
Tunable coherence laser interferometry: demonstrating 40dB of straylight suppression and compatibility with resonant optical cavities
University of Hamburg（汉堡大学）；Max Planck Institute for Gravitational Physics (Albert Einstein Institute)（马克斯·普朗克引力物理研究所（爱因斯坦研究所））；Leibniz University Hannover（汉诺威莱布尼茨大学）；Helmut Schmidt University（赫尔穆特·施密特大学）；E.L. Ginzton Laboratory, Stanford University（斯坦福大学Ginz顿实验室）
Wave Front Sensing demodulated at the difference frequency between two phase-modulation sidebands in a compound interferometer configuration for a gravitational-wave detector
Institute for Cosmic Ray Research (ICRR), KAGRA Observatory, The University of Tokyo（东京大学宇宙射线研究所（ICRR），KAGRA天文台）；Graduate School of Science and Technology, Niigata University（新潟大学科学技术研究生院）
