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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 4 — Feb. 25, 2013
  • pp: 4061–4071

Spatial coherence measurement of polychromatic light with modified Young’s interferometer

Kimmo Saastamoinen, Jani Tervo, Jari Turunen, Pasi Vahimaa, and Ari T. Friberg  »View Author Affiliations

Optics Express, Vol. 21, Issue 4, pp. 4061-4071 (2013)

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Partial spatial coherence is a fundamental concept in optical systems. Theoretically, the normalized mutual coherence function gives a quantitative measure for partial spatial coherence regardless of the spectral nature of the radiation. For narrowband light the degree of spatial coherence can be measured in terms of the fringe modulation in the classic Young’s two-pinhole interferometer. Though not commonly appreciated, with polychromatic radiation this is not the case owing to the wavelength dependence of diffraction. In this work we show that with a modified two-beam interferometer containing an achromatic Fresnel transformer the degree of spatial coherence is again related to the visibility of intensity fringes in Young’s experiment for any polychromatic light. This result, which is demonstrated both theoretically and experimentally, thus restores the usefulness of the two-pinhole interferometer in the measurement of the spatial coherence of light beams of arbitrary spectral widths.

© 2013 OSA

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(050.1940) Diffraction and gratings : Diffraction
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(260.3160) Physical optics : Interference

ToC Category:
Coherence and Statistical Optics

Original Manuscript: November 20, 2012
Revised Manuscript: January 11, 2013
Manuscript Accepted: January 11, 2013
Published: February 11, 2013

Kimmo Saastamoinen, Jani Tervo, Jari Turunen, Pasi Vahimaa, and Ari T. Friberg, "Spatial coherence measurement of polychromatic light with modified Young’s interferometer," Opt. Express 21, 4061-4071 (2013)

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