Session Index

I will introduce holographic data storage systems that write and read multi-channel time series signals. Physically, the system is the same as normal page data based holographic memory system, but each pixel of the page based system acts as a channel that carries a time series signal. The time series signal system can be realized in both angle multiplexed and collinear systems, and amplitude, phase, polarization modulated signals can be used. Because Run Length Limited coding can be applied to these systems, the unit angle or shift length for the time series signal can be smaller than the page separation in the page data based systems. Thus, the data storage density can be much larger than that of the conventional systems. Also, it is a great advantage that matured signal processing technique for the time series signal be applied to these systems. I will show some numerical and experimental results in these systems, and discuss the signal quality and write-read properties.

 

Optical scanning holography (OSH) is a highly sophisticated technology with many facets and applications [1]. OSH is a based on a two-pupil optical heterodyning system [2]. By designing the pupils, we can obtain different computational operations achievable in the system. In this invited talk, we will concentrate on the use of OSH to achieve holographic recording of the edge information of incoherent 3D images. We will first review some of the edge extraction examples, and then we discuss the use of one of the pupils as an annular aperture with the other pupil being a delta function to extract the edge information of incoherent images holographically. We show some simulation results.

 

An algorithm which combined the Angular Spectrum (AS) and the Hybrid Iterative Fourier Transform Algorithm (HIFTA), called Modified Angular Spectrum Algorithm (MASA) was proposed. The MASA has the multi-amplitude constraints, so that it can reduce the iteration times and also have higher image quality at different focus length.

 

Point scanning of conventional confocal techniques is time-consuming. In addition to the lateral scanning, the confocal system is required to construct the three-dimensional images. Here, a non-axial-scanning slit confocal microscopy is presented. The proposed system combines multiplexed volume holographic gratings (MVHGs) in illumination and corresponding confocal slit apertures.

 

We present an activated pump and probe technique for fluorescent microbeads. The probing procedure employs the digital holographic microscopy (DHM) to realize real-time three-dimensional (3-D) tracking. The tracking results are analyzed for designing the computer-generated hologram (CGH). The readout of CGH will generate pumping beams for the specific fluorescent microbeads.