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Pub type J
Title Enhanced wavefront reconstruction by random phase modulation with a
phase diffuser
Author/s Almoro, PF 

Pedrini, G

Gundu, PN

Osten, W

Hanson, SG

Journal source OPTICS AND LASERS IN ENGINEERING
Volume 49
Issue 2
Start page 252
End page 257
Pub year 2011
Times cited 0
Abstract A phase retrieval technique for enhanced wavefront reconstruction using
random phase modulation and a phase diffuser is proposed. The speckle
field generated is sampled at multiple axially displaced planes and the
speckle patterns are used in an iterative algorithm based on the
optical wave propagation in free space. The presentation of this
technique is carried out using two setups. In the first setup, a
diffuser plate is placed at the image plane of a metallic test object.
The benefit of randomizing the phase of the object wave is the enhanced
intensity recording due to high dynamic range of the diffusely
scattered beam. The use of demagnification optics will also allow the
investigations of relatively large objects. In the second setup, a
transparent object is illuminated using a wavefront with random phase
and constant amplitude by positioning the phase diffuser close to the
object. The benefit of phase-only modulation is the increased
resolution of the phase structures of the transparent test objects. (C)
2010 Elsevier Ltd. All rights reserved.
UT WOS:000285169500010
SN 0143-8166
DI 10.1016/j.optlaseng.2010.09.012
ER
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