Proof-of-principle demonstration of a polarization-circulation speed meter

Yohei Nishino; Tomotada Akutsu; Yoichi Aso; Munetake Otsuka; Luise Kranzhoff; Takayuki Tomaru

doi:10.1103/5zyh-lg9b

Proof-of-principle demonstration of a polarization-circulation speed meter

Yohei Nishino ^1,2,*, Tomotada Akutsu ², Yoichi Aso ^2,3, Munetake Otsuka ^1,2, Luise Kranzhoff ^4,5, and Takayuki Tomaru^1,2,3,6,7

¹Department of Astronomy, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
²Gravitational Wave Science Project, National Astronomical Observatory of Japan (NAOJ), Mitaka City, Tokyo 181-8588, Japan
³The Graduate University for Advanced Studies (SOKENDAI), Mitaka City, Tokyo 181-8588, Japan
⁴Maastricht University, Department of Gravitational Waves and Fundamental Physics, 6200MD Maastricht, The Netherlands
⁵Nikhef, Science Park 105, 1098 XG Amsterdam, The Netherlands
⁶Accelerator Laboratory, High Energy Accelerator Research Organization (KEK), Tsukuba City, Ibaraki 305- 0801, Japan
⁷Institute for Cosmic Ray Research (ICRR), KAGRA Observatory, The University of Tokyo, Kashiwa City, Chiba 277-8582, Japan

^*Contact author: yohei.nishino@grad.nao.ac.jp

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Phys. Rev. D 113, 022004 – Published 23 January, 2026

DOI: https://doi.org/10.1103/5zyh-lg9b

Abstract

We present the first experimental implementation of a polarization-circulation speed meter. In our experiment, the interferometer was reduced to a single-cavity configuration with all mirrors fixed. A green-locking scheme was employed to stabilize the polarization-circulation cavity, and a lock-acquisition procedure was demonstrated to realize speed-meter operation. The system was characterized by measuring the transfer function from a pseudodisplacement signal to the photodetector output, confirming that the device measures the speed of mirror motion. These results support the feasibility of polarization-circulation speed meters and suggest that the control scheme could be extended to more complex configurations, such as Michelson interferometers and suspended-mirror systems.

Physical Review D

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Proof-of-principle demonstration of a polarization-circulation speed meter

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