Twin-image elimination experiments for three-dimensional images in optical scanning holography

Abstract

Twin-image elimination in the context of optical scanning holography has recently been proposed. The proposed technique involves simultaneously acquiring sine and cosine Fresnel holograms. A complex hologram is then formed by complex addition of the holograms, and twin-image rejection is predicted by computer simulations. An experimental verification of the technique by optical acquisition of the two holograms and subsequent reconstruction of the complex hologram digitally is reported. Three-dimensional image reconstruction without twin-image noise is demonstrated.

Scanning Holography Using a Modulated Linear Pupil: Simulations

“…From the properties of convolution product of a function with a delta function leave it unchanged, then Equation (11) is reduced to the OTF of Poon [13] to give:…”

“…The original idea, which was later analyzed and called scanning holography [13], is to scan the 3-D object in a 2 -D raster with a complex Fresnel zone plate-type impulse response created by interference of a point source and a plane wave emerging from each pupil. A temporal frequency offset is introduced between the two pupils and the desired signal from a spatially integrating detector is obtained using a heterodyne detection.…”

Extraction of a Distance Parameter in Optical Scanning Holography Using Axis Transformation

“…At each scanning location, the In-phase and Quadrature-phase output currents iI(x, y; z) and iQ(x, y; z) are generated by a phase sensitive detection scheme and stored in a digital computer according to the scanning locations. A complex hologram is constructed subsequently by adding the two stored outputs in the following manner [12,13] ( ) ( )dz (1) where z 0 is the distance from the focal point of the spherical wave to the middle of the specimen (described as a distance parameter) [11], and  is the depth range of the specimen. Here, a(z) = NA × z determines the radius of the TD-FZP where represents the numerical aperture defined as the sine of the half-cone angle subtended by the temporally modulated FZP.…”

Complex Fresnel hologram display using a single SLM

“…Another way to remove the zeroorder light and the twin image is to create a complex hologram. The reconstruction of the complex hologram is free of the zero-order light and the twin image [10]. Unfortunately, current SLMs can modulate either phase or intensity of an incident light, but not both [11,12].…”