Open AccessTwo-wavelength interferometer based on sinusoidal phase modulation with an acetylene stabilized laser and a second harmonic generation
Author(s) -
Y. Kawata,
Kyohei Hyashi,
Tomohiro Aoto
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.016024
Subject(s) - interferometry , optics , astronomical interferometer , materials science , wavelength , laser , phase modulation , modulation (music) , phase (matter) , optical path , physics , phase noise , quantum mechanics , acoustics
A two-wavelength interferometer (TWI) based on a sinusoidal-phase-modulation method with an acetylene stabilized laser and a second harmonic generation (SHG) was developed. The periodic non-linearity error for the TWI was estimated to be ± 0.1 µm at a dead path of 0.32 m. A long-term measurement showed that the TWI stability was ± 3 × 10(-7) at a dead path of 1.00 m for 12 hours with an ambient pressure variation of 3 hPa under controlled conditions of ambient temperature and humidity. Finally, we confirmed that the TWI has substantially better stability than a single-wavelength interferometer by comparing both interferometers with large temporal and spatial temperature variations.