Abstract: An optical system for use in an infrared camera which includes, in order from an object side: a first lens group having a negative refractive power and a second lens group having a positive refractive power arranged a distance from the first lens group. The first lens group comprises a negative meniscus lens having a convex surface facing toward the object side and the second lens group comprising, in order from the object side: a first lens having a positive refractive power, a second lens having a negative refractive power and a third lens having a positive refractive power. The lenses comply with the following conditions: (1) 0.5.PHI.<-.PHI.f<0.7.PHI., (2) 0.55.PHI.<.PHI.r<0.87.PHI., (3) 1.55 (1/.PHI.)<d<1.98 (1/.PHI.) and (4) dr<2.1 (1/.PHI.). The conditions are defined by: .PHI.: is the overall refractive power for the overall optical system for the infrared camera, .PHI.f: is the refractive power for the first lens group, .PHI.

Abstract: A method and device for measuring the mobility distribution of particulate elements using incoherent light holography, where the particulate elements are optically labeled. An elementary hologram is formed for each particulate element at a series of periodic moments representing the transfer function as a function of the instantaneous position of that element. The transfer function is modulated by a specified periodic transfer function for labeling each simple hologram and for generating conjugate elementary holograms integrated at each moment for forming a compound velocity hologram containing coded information for each particulate element. Each compound velocity hologram is decoded to obtain specified mobility information.

Abstract: A spectacle lens structure includes a light transmitting base plate having a serrated surface defining a hologram. A thin reflective coating having a planar outer surface is provided on the serrated surface to partially reflect an incident light and allow the remaining portion of the incident light to penetrate and diffract about the serration for the formation of the holographic image. The reflective coating may be of a refractive index quite different from that of the base plate so as to provide a brazed 3-D image. If the reflective coating is made of a material having a refractive index close to the base plate, then a further coating having a high refractive index, such as ZnS, has to be provided on the reflective coating to provide a brazed 3-D image.

Abstract: Systems and methods for steering a complex, spatially-modulated incident beam of light from a spatial light modulator to gain access to data locations in a holographic memory cell (HMC). One of the systems includes (1) a primary beam steering system that receives the incident beam of light from the spatial light modulator and produces a resulting beam of light, wherein the primary beam steering system traverses the resulting beam of light across a plane of the HMC in increments having a first magnitude and 2) a fine-control translation mechanism, coupled to the spatial light modulator, that translates the spatial light modulator relative to the primary beam steering system to cause the resulting beam of light to traverse the plane of the HMC in increments having a second magnitude smaller than the first magnitude.

Abstract: A method for processing information stored in a holographic system, comprising the step of intersecting a reconstruction reference beam with a storage medium of a holographic system, the storage medium exhibiting birefringence at least partially due to coherent storage of information, wherein the reconstruction reference beam has a polarization at least 5.degree. different from the polarization exhibited by a storage reference beam during storage information in the storage medium.

Abstract: Embodiments of the invention include a data receiving apparatus and method of a holographic or other page-wise memory system for processing information read from the memory system's storage medium. The data apparatus includes a multi-dimensional array of pixel elements comprised of pixel detectors and corresponding pixel circuit. The pixel detectors detect information such as light information representing data stored in the memory system. The pixel circuits determine a value representative of the information detected by the individual pixel detectors. Additionally, the apparatus includes active processing circuitry advantageously fabricated in conjunction with the pixel circuits to provide additional "on-chip" processing capabilities, including analog inter-pixel processing. The advantageous arrangement of the additional processing improves processing times, reduces the unprocessed data flow out of the apparatus, and reduces circuitry design space and cost.