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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 22 — Nov. 15, 2013
  • pp: 4522–4525

Lateral-shearing, delay-dithering Mach–Zehnder interferometer for spatial coherence measurement

Anatoly Efimov  »View Author Affiliations

Optics Letters, Vol. 38, Issue 22, pp. 4522-4525 (2013)

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An image-shearing interferometer of Mach–Zehnder type with corner cubes is introduced for the purpose of measuring spatial coherence at the output of inhomogeneous optical sources, such as multimode fibers (MMFs). One arm of the interferometer is modulated in optical delay to produce dynamic interference fringes. Fringe visibility and the two individual intensities are measured nearly simultaneously to allow direct calculation of the modulus of the complex degree of coherence as a function of the lateral shear between the two interferometer arms. Spatial degree of coherence is measured for a step-index MMF pumped with monochromatic and broadband optical sources.

© 2013 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(060.2270) Fiber optics and optical communications : Fiber characterization
(120.3180) Instrumentation, measurement, and metrology : Interferometry

ToC Category:
Coherence and Statistical Optics

Original Manuscript: August 15, 2013
Manuscript Accepted: October 3, 2013
Published: November 4, 2013

Anatoly Efimov, "Lateral-shearing, delay-dithering Mach–Zehnder interferometer for spatial coherence measurement," Opt. Lett. 38, 4522-4525 (2013)

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