Interferometric dynamic displacement measurement using phase-modulated light along with stepwise control of operation point. (23rd October 2018)

• Record Type: Journal Article
• Authors: Tanaka, Yosuke; Ueda, Kohei
• Is Part Of: Applied physics express. Volume 11:Number 11(2018)
• Publication Date: 2018-10-23
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.11.112501
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We propose the fiber-based interferometric measurement of tens-of-nanometer-scale dynamic displacement that uses phase-modulated reference light with stepwise control of the operation point of modulation (OPM). It requires neither the pre-adjustment of the OPM nor feedback control for the path-length difference of the interferometer. Quantitative evaluation of the system is performed by using a phase modulator as a sample to simulate mechanical vibration. The dynamic displacement for 100-kHz vibration with an amplitude of 19 nm is measured even when the fiber interferometer is intentionally perturbed, which confirms the effectiveness of the proposed method.