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Applied Optics

Applied Optics


  • Vol. 32, Iss. 23 — Aug. 10, 1993
  • pp: 4410–4414

Enhancement of far-field spatial coherence of a partially coherent light source by source masking

V. Boopathi, R. M. Vasu, and L. Kameswara Rao  »View Author Affiliations

Applied Optics, Vol. 32, Issue 23, pp. 4410-4414 (1993)

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The role of a sharp autocorrelation phase mask, called the bleached uniformly redundant array, for improving the spatial coherence in the far-field of partially coherent light sources is studied. It is shown both theoretically and experimentally that the input source correlation plays an important role in determining the amount of enhancement introduced by the phase mask.

© 1993 Optical Society of America

Original Manuscript: March 9, 1992
Published: August 10, 1993

V. Boopathi, R. M. Vasu, and L. Kameswara Rao, "Enhancement of far-field spatial coherence of a partially coherent light source by source masking," Appl. Opt. 32, 4410-4414 (1993)

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  1. V. Boopathi, R. M. Vasu, “Coherent optical processing with noncoherent light after source masking,” Appl. Opt. 31, 186–191 (1992). [CrossRef] [PubMed]
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  13. The γ(Δr) plots are one-dimensional cross sections of the two-dimensional circular symmetric mutual intensity functions from the URA, which has a circular symmetric autocorrelation function. Since the URA is two dimensional, we replaced it with a 2 mm × 2 mm clear aperture, and the plot 2k is a one-dimensional cross section through the center of the corresponding two-dimensional mutual intensity, which has no circular symmetry.
  14. The surface roughness of the diffuser, or a related parameter, the surface height decorrelation length, is an important parameter that controls the way spatial coherence of light is varied by this method. We prepared the diffuser used by spray painting colorless lacquer onto Perspex disks. Such diffusers are relatively smooth as compared with ground-glass screens that are obtained with the finest emery available.
  15. The bleached URA is prepared such that the phase difference between the two regions present is π. Phase steps were created on a test plate by recording and bleaching an intensity step wedge with different exposure times. The bleached plate was tested in a Twyman–Green interferometer to determine the right exposure time for a π phase difference.
  16. Young’s fringes for a number of double slits are recorded on the same type of emulsion and processed under identical conditions. The processed film is illuminated by an unexpanded laser beam. The illumination intensity and the + 1-order diffracted intensity are measured with a photomultiplier tube. The ratio of the photocurrents corresponding to +1-order diffraction and the illumination intensity is proportional to the fringe visibility in the record.

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