Polarization-Maintaining Diffractive Elements for Off-Axis Terahertz Digital Holography

Six-pack off-axis holography.

We present a new holographic concept, named six-pack holography (6PH), in which we compress six off-axis holograms into a single multiplexed off-axis hologram without loss of magnification or resolution. The multiplexed hologram contains straight off-axis fringes with six different orientations, and can be generated optically or digitally. We show that since the six different complex wavefronts...

A Phase Space Perspective on Electron Holography - Building Bridges Between Inline-, Off-axis Holography, Differential Phase Contrast and Diffractive Imaging

Electron Holography (EH) was originally invented by D. Gabor in an attempt to correct the insurmountable spherical aberration of the objective lens in a Transmission Electron Microscope (TEM). The holographic principle proved so general that it found its way into a wide variety of techniques all aiming at reconstructing the phase information in a wave field of a particular radiation (not necess...

Iterative method for zero-order suppression in off-axis digital holography.

We propose a method to suppress the so-called zero-order term in a hologram, based on an iterative principle. During the hologram acquisition process, the encoded information includes the intensities of the two beams creating the interference pattern, which do not contain information about the recorded complex wavefront, and that can disrupt the reconstructed signal. The proposed method selecti...

Real Time Temperature Distribution Measurement of a Microheater by Using Off-Axis Digital Holography

Real-time quantitative phase reconstruction in off-axis digital holography using multiplexing.

We present a new approach for obtaining significant speedup in the digital processing of extracting unwrapped phase profiles from off-axis digital holograms. The new technique digitally multiplexes two orthogonal off-axis holograms, where the digital reconstruction, including spatial filtering and two-dimensional phase unwrapping on a decreased number of pixels, can be performed on both hologra...