Applications of memory function utilizing spatial light modulators are emphasized. The optical association using analog memory of MSLM, the displacement meter using binary memory of FLC-SLM and the bistable optically addressable memory system using PAL-SLM are reviewed.
Wideband optical signal processing for adaptive antennas calls for a high-performance spatial light amplifier (SLA). The latter can be implemented as an upgrade of micro-channel SLA by replacing bulk crystal with a single-crystal fiber array (SCFA). This paper is focused on SCFA fabrication. The design process from specifying SCFA parameters to selecting fabrication technique (dice-and-fill or laser-heated pedestal growth) is reviewed. The results achieved with the dice-and- fill method are presented.
Two types of electron tube spatial light modulators and three types of liquid crystal spatial light modulators have been developed. They are applied to various optical analog computing systems, which include a stellar speckle interferometer, a displacement meter and a fingerprint meter and a fingerprint identification system.
The principles of the linear electro-optic effect and the nonlinear optic effect in optical crystals are explained. Devices utilizing these effects, which are a spatial light modulator, an electro-optic probing system and an optical parametric oscillator, are described.
We first briefly review a new 3-D imaging technique called optical scanning holography (OSH). We then discuss the technique's 3-D holographic magnification in the context of optical scanning and digital reconstruction. Finally, we demonstrate the 3-D imaging capability of OSH by holographically recording two planar objects at different depths and reconstructing the hologram digitally.
We first review a newly developed 3D imaging technique called optical scanning holography (OSH), and discuss recording and reconstruction of a point object using the principle of OSH. We then derive 3D holographic magnification, using three points configured as a 3D object. Finally, we demonstrated 3D imaging capability of OSH by holographically recording two planar objects at different depths and reconstructing the hologram digitally.
Holographic information pertaining to an object can be generated using an active optical heterodyne scanning technique. In this technique, the holographic information manifests itself as an electrical signal which can be sent to an electron-beam-addressed spatial light modulator for coherent image reconstruction. Real-time holographic imaging of 2-D objects has recently been demonstrated. The use of alternate waveforms in the scanning beam can process the holographic content of the object in real time. In this communication, we propose a holographic edge extraction technique which utilizes alternate waveforms in the optical scanning holographic recording stage. We have developed a 1-D computer model of the optical heterodyne scanning holographic system using Fourier analysis which we use to simulate holographic edge extraction.
Our research has been performed by aiming at the measurement in the extreme regions, such as at extreme low light level or ultra high speed. Image tubes are key devices for these purposes, therefore two-dimensional low light level detection tubes and streak tubes have been developed. The low light level detection tubes have realized imaging in the photon-counting region, and the streak tubes have reached the femto second temporal resolution range. These devices have been utilized in various fields.