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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 8 — Apr. 15, 2010
  • pp: 1260–1262

Fiber-coupled, Littrow-grating cavity displacement sensor

Graham Allen, Ke-Xun Sun, and Robert Byer  »View Author Affiliations

Optics Letters, Vol. 35, Issue 8, pp. 1260-1262 (2010)

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We have demonstrated a compact, optical-fiber-fed, optical displacement sensor utilizing a Littrow-mounted diffraction grating to form a low-finesse Fabry–Perot cavity. Length changes of the cavity are read out via the Pound–Drever–Hall rf modulation technique at 925 MHz . The sensor has a nominal working distance of 2 cm and a total dynamic range of 160 nm . The displacement noise floor was less than 3 × 10 10 m Hz above 10 2 Hz , limited by the frequency drift of the reference laser. A frequency-stabilized laser would reduce the noise floor to below 10 12 m Hz . The use of a 925 MHz modulation frequency demonstrates high-precision readout of a low-finesse compact resonant cavity.

© 2010 Optical Society of America

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: January 11, 2010
Manuscript Accepted: February 9, 2010
Published: April 15, 2010

Graham Allen, Ke-Xun Sun, and Robert Byer, "Fiber-coupled, Littrow-grating cavity displacement sensor," Opt. Lett. 35, 1260-1262 (2010)

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