Sensitivity of Chronos : the Taiwanese gravitational wave detector

Avani Patel^1,2*, Yuki Inoue^2,1

¹Institute of Physics, Academia Sinica, Taipei, Taiwan
²Physics, National Central University, Taoyuan, Taiwan

* Presenter:Avani Patel, email:avani.physics@gmail.com

According to ”Quantum Measurement Theory”, the devices which measure
the momentum, or speed of free test masses are immune to the Standard Quantum Limit(SQL). Chronos is a Sagnac-interferometer gravitational-wave detector which is a speed meter and therefore in principle it can beat the SQL by large amounts over a wide band of frequencies.
In a Sagnac interferometer, a laser beam is split in two, and each of the two beams travels successively through both arms, though in the opposite
direction. When the two beams are finally recombined, a signal sensitive to the time-dependent part of the arm-length difference is obtained. Here, we discuss the input-output relation for the basic optical configuration of Sagnac interferometer and give the estimate of the sensitivity curve of Chronos. We also develop the sensing functions necessary for the calibration of the interferometer.

Keywords: Gravitational Wave, interferometer, sensitivity, calibration