skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A fiber-optic interferometer with subpicometer resolution for dc and low-frequency displacement measurement

Abstract

We have developed a fiber-optic interferometer optimized for best performance in the frequency range from dc to 1 kHz, with displacement linearity of 1% over a range of {+-} 25 nm, and noise-limited resolution of 2 pm. The interferometer uses a tunable infrared laser source (nominal 1550 nm wavelength) with high amplitude and wavelength stability, low spontaneous self-emission noise, high sideband suppression, and a coherence control feature that broadens the laser linewidth and dramatically lowers the low-frequency noise in the system. The amplitude stability of the source, combined with the use of specially manufactured ''bend-insensitive'' fiber and all-spliced fiber construction, results in a robust homodyne interferometer system, which achieves resolution of 40 fm Hz{sup -1/2} above 20 Hz and approaches the shot-noise-limit of 20 fm Hz{sup -1/2} at 1 kHz for an optical power of 10 {mu}W, without the need for differential detection. Here we describe the design and construction of the interferometer, as well as modes of operation, and demonstrate its performance.

Authors:
;  [1];  [2]
  1. National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
  2. Precera, Inc., Damascus, Maryland 20872 (United States)
Publication Date:
OSTI Identifier:
21266784
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 80; Journal Issue: 3; Other Information: DOI: 10.1063/1.3097187; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; AMPLITUDES; DESIGN; DETECTION; INTERFEROMETERS; KHZ RANGE; LASERS; NOISE; OPERATION; OPTICAL FIBERS; PERFORMANCE; RESOLUTION; STABILITY; VISIBLE RADIATION; WAVELENGTHS

Citation Formats

Smith, D T, Pratt, J R, and Howard, L P. A fiber-optic interferometer with subpicometer resolution for dc and low-frequency displacement measurement. United States: N. p., 2009. Web. doi:10.1063/1.3097187.
Smith, D T, Pratt, J R, & Howard, L P. A fiber-optic interferometer with subpicometer resolution for dc and low-frequency displacement measurement. United States. doi:10.1063/1.3097187.
Smith, D T, Pratt, J R, and Howard, L P. Sun . "A fiber-optic interferometer with subpicometer resolution for dc and low-frequency displacement measurement". United States. doi:10.1063/1.3097187.
@article{osti_21266784,
title = {A fiber-optic interferometer with subpicometer resolution for dc and low-frequency displacement measurement},
author = {Smith, D T and Pratt, J R and Howard, L P},
abstractNote = {We have developed a fiber-optic interferometer optimized for best performance in the frequency range from dc to 1 kHz, with displacement linearity of 1% over a range of {+-} 25 nm, and noise-limited resolution of 2 pm. The interferometer uses a tunable infrared laser source (nominal 1550 nm wavelength) with high amplitude and wavelength stability, low spontaneous self-emission noise, high sideband suppression, and a coherence control feature that broadens the laser linewidth and dramatically lowers the low-frequency noise in the system. The amplitude stability of the source, combined with the use of specially manufactured ''bend-insensitive'' fiber and all-spliced fiber construction, results in a robust homodyne interferometer system, which achieves resolution of 40 fm Hz{sup -1/2} above 20 Hz and approaches the shot-noise-limit of 20 fm Hz{sup -1/2} at 1 kHz for an optical power of 10 {mu}W, without the need for differential detection. Here we describe the design and construction of the interferometer, as well as modes of operation, and demonstrate its performance.},
doi = {10.1063/1.3097187},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 3,
volume = 80,
place = {United States},
year = {2009},
month = {3}
}