Parallel-quadrature phase-shifting digital holographic microscopy using polarization beam splitter

OPTICS COMMUNICATIONS

卷:285

Article

Das, Bhargab¹  Yelleswarapu, Chandra S.¹  Rao, D. V. G. L. N.¹ 

[1] Univ Massachusetts, Dept Phys, Boston, MA 02125 USA

关键词: Digital holography;    Microscopy;    Phase shifting;    Image reconstruction techniques;   

DOI  :  10.1016/j.optcom.2012.07.101

来源: Elsevier

【 摘 要 】

We present a digital holography microscopy technique based on a parallel-quadrature phase-shifting method. Two pi/2 phase-shifted holograms are recorded simultaneously using polarization phase-shifting principle, slightly off-axis recording geometry, and two identical CCD sensors. The parallel phase-shifting is realized by combining circularly polarized object beam with a 45 degree polarized reference beam through a polarizing beam splitter. DC term is eliminated by subtracting the two holograms from each other and the object information is reconstructed after selecting the frequency spectrum of the real image. Both amplitude and phase object reconstruction results are presented. Simultaneous recording eliminates phase errors caused by mechanical vibrations and air turbulences. The slightly off-axis recording geometry with phase-shifting allows a much larger dimension of the spatial filter for reconstruction of the object information. This leads to better reconstruction capability than traditional off-axis holography. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

Free