This article is cited in 14 papers

Optical fields

Longitudinal correlation properties of an optical field with broad angular and frequency spectra and their manifestation in interference microscopy

D. V. Lyakin^ab, V. P. Ryabukho<sup>ab

a</sup> Saratov State University
^b Institute of Precision Mechanics and Control, Russian Academy of Sciences, Saratov

Abstract: The results of theoretical and experimental studies of the longitudinal correlation properties of an optical field with broad angular and frequency spectra and manifestations of these properties in interference microscopy are presented. The joint and competitive influence of the angular and frequency spectra of the object-probing field on the longitudinal resolution and on the amplitude of the interference microscope signals from the interfaces between the media inside a multilayer object is demonstrated. The method of compensating the so-called defocusing effect that arises in the interference microscopy using objectives with a large numerical aperture is experimentally demonstrated, which consists in using as a light source in the interference microscope an illuminating interferometer with a frequency-broadband light source. This method of compensation may be used as the basis of simultaneous determination of geometric thickness and refractive index of media forming a multilayer object.

Keywords: interference microscopy, frequency-broadband light sources, longitudinal correlation properties of optical field.

PACS: 42.25.Hz, 42.30.-d, 42.87.-d

Received: 28.03.2013

 English version: Quantum Electronics, 2013, 43:10, 949–957

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