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Wavelet filters for programmable object investigation in digital holographic microscopy

M. MIHAILESCU1,* , A. M. PREDA1, E. I. SCARLAT1

Affiliation

  1. Physics Department, University “Politehnica” of Bucharest, Romania

Abstract

In this paper we present the application of the digital holographic microscopy in the investigation of a transparent object. In the experimental setup, based on the Mach-Zehnder interferometer with microscope objectives in both arms, we record on the CCD the hologram of a liquid crystal display, an electronically addressable device. The advantage of the digital processing of the recorded holograms is the fact that we can apply numerical filters (wavelet filter in our case), and study their effect in the contrast and the resolution of the fringe system, with the aim to eliminate the experimental aberrations. Based on the Fresnel transform, we simulate the propagation of the diffracted wave, after it passes through the hologram. Therefore we obtain information about the phase of the studied object when we address the same gray level or different gray levels on neighboring pixels. The simulation and experimental results are presented. Some parameters of the investigated object (birefringence, extraordinary refractive index, fill factor) were calculated..

Keywords

Digital holographic microscopy, Wavelet filters, Fresnel transform, Phase, Mach-Zehnder, Liquid crystal display.

Submitted at: Dec. 15, 2009
Accepted at: Jan. 20, 2010

Citation

M. MIHAILESCU, A. M. PREDA, E. I. SCARLAT, Wavelet filters for programmable object investigation in digital holographic microscopy, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 1, pp. 94-99 (2010)