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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 36 — Dec. 20, 2008
  • pp: 6860–6870

Excess noise reduction by optical technique in amplitude-sensitive heterodyne interferometer for small differential phase detection

Hui-Kang Teng and Kuo-Chen Lang  »View Author Affiliations

Applied Optics, Vol. 47, Issue 36, pp. 6860-6870 (2008)

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An amplitude-sensitive technique associated with a heterodyne interferometer for detecting small differential phase is reported. The excess noise with the amplitude-sensitive technique is reduced by optical subtraction instead of electronic subtraction. The differential phase introduced by the orthogonally polarized laser beams is converted to the amplitudes of two heterodyne interferometric signals, which presents amplitude and phase quadrature simultaneously. Thus the excess noise power and quantum noise power are both differential phase dependent. The advantages of differential and additive operations by optical technique and the real time differential phase determination without phase lock in are demonstrated experimentally. The theoretical signal-to-noise ratio (SNR) and minimum detectable differential phase are derived, which takes quantum noise and excess noise into consideration. The experimental results demonstrated the resolutions of differential phase detection closes to 10 6 rad / Hz ( 10 13 m / Hz ) level over 100 kHz bandwidth and at 10 8 rad / Hz ( 10 15 m / Hz ) level over 125 MHz bandwidth, respectively, under 2.5 mW incident power.

© 2008 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: August 15, 2008
Manuscript Accepted: November 4, 2008
Published: December 18, 2008

Hui-Kang Teng and Kuo-Chen Lang, "Excess noise reduction by optical technique in amplitude-sensitive heterodyne interferometer for small differential phase detection," Appl. Opt. 47, 6860-6870 (2008)

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