Demonstration of tilt sensing using a homodyne quadrature interferometric translational sensor

• DOI: 10.1088/1361-6382/add3b4
• Publication Date: 2025-05-14T12:35:26Z
• Authors: Koji Nagano; Karera Mori; Kiwamu Izumi
• Keywords: Direct-conversion receiver; Quadrature (astronomy)

Abstract Future gravitational wave observation in space will demand improvement the sensitivity of local sensor for drag-free control. This paper presents proposal, design, and demonstration a new laser interferometric named Quadrature Interferometric Metrology Translation Tilt (QUIMETT) sensor. QUIMETT enables simultaneous measurements both translational displacement tilts reflective object with single interferometer package. offers characteristic feature where to tilt is independent interference condition while maintaining ability measure range greater than wavelength. The tilt-sensing function has been demonstrated prototype experiment. remained unchanged different conditions stayed at 10 nrad Hz <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msup> <mml:mrow/> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> </mml:math> 0.1 Hz.