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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 28 — Oct. 1, 2009
  • pp: 5259–5265

Spatial phase filtering based on the intensity-dependent refractive index of PbS nanocomposite film

Pushpa Ann Kurian and C. Vijayan  »View Author Affiliations


Applied Optics, Vol. 48, Issue 28, pp. 5259-5265 (2009)
http://dx.doi.org/10.1364/AO.48.005259


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Abstract

We demonstrate the use of stable films containing PbS nanocrystals as media for self-adaptive phase filtering in phase contrast imaging of transparent objects by a cost-effective exploitation of nonlinear optical refraction in a simple, all-optical, and self-adjusting 4 f imaging system. The optical nonlinearity is characterized by z-scan technique using a continuous wave He–Ne laser as the excitation source. The mechanism of nonlinearity in this case is mainly due to the nonlocal thermo-optical interaction between the laser beam and the sample. The value of nonlinear refractive index coefficient is found to be 3.5 × 10 7 cm 2 / W . The nanocomposite material shows a thermal lens effect and is a potential candidate for phase contrast imaging.

© 2009 Optical Society of America

OCIS Codes
(190.4400) Nonlinear optics : Nonlinear optics, materials
(100.4997) Image processing : Pattern recognition, nonlinear spatial filters

ToC Category:
Image Processing

History
Original Manuscript: May 5, 2009
Revised Manuscript: August 25, 2009
Manuscript Accepted: September 1, 2009
Published: September 21, 2009

Citation
Pushpa Ann Kurian and C. Vijayan, "Spatial phase filtering based on the intensity-dependent refractive index of PbS nanocomposite film," Appl. Opt. 48, 5259-5265 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-28-5259


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