Coherent and incoherent beam combination using thick holographic substrates

Shahriar, M. S.; Riccobono, J.; Kleinschmit, M.; Shen, John T.

doi:10.1016/s0030-4018(03)01371-3

Cited by 24 publications

(10 citation statements)

References 15 publications

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“…In order to realize this approach it is necessary to make holographic video discs with a thickness of 1 cm. One material suitable for realizing such a disc is made of PMMA (polymethyl methalycrate), doped with the dye called phenanthren-quinone 36,37,38,39,40,41,42,43,44 .…”

Section: Implementing Aer Employing a Vapor Cell A Holographic Videomentioning

confidence: 99%

All optical three dimensional spatio-temporal correlator for automatic event recognition using a multiphoton atomic system

Monjur

Fouda

Shahriar

2016

Optics Communications

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We describe an automatic event recognition (AER) system based on a three-dimensional spatio-temporal correlator (STC) that combines the techniques of holographic correlation and photon echo based temporal pattern recognition. The STC is shift invariant in space and time. It can be used to recognize rapidly an event (e.g., a short video clip) that may be present in a large video file, and determine the temporal location of the event. Using polar Mellin transform, it is possible to realize an STC that is also scale and rotation invariant spatially. Numerical simulation results of such a system are presented using quantum mechanical equations of evolution. For this simulation we have used the model of an idealized, decay-free two level system of atoms with an inhomogeneous broadening that is larger than the inverse of the temporal resolution of the data stream. We show how such a system can be realized by using a lambda-type three level system in atomic vapor, via adiabatic elimination of the intermediate state. We have also developed analytically a three dimensional transfer function of the system, and shown that it agrees closely with the results obtained via explicit simulation of the atomic response. The analytical transfer function can be used to determine the response of an STC very rapidly. In addition to the correlation signal, other nonlinear terms appear in the explicit numerical model. These terms are also verified by the analytical model. We describe how the AER can be operated in a manner such that the correlation signal remains unaffected by the additional nonlinear terms. We also show how such a practical STC can be realized using a combination of a porous-glass based Rb vapor cell, a holographic video disc, and a lithium niobate crystal.

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Section: Implementing Aer Employing a Vapor Cell A Holographic Videomentioning

confidence: 99%

All optical three dimensional spatio-temporal correlator for automatic event recognition using a multiphoton atomic system

Monjur

Fouda

Shahriar

2016

Optics Communications

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“…The HMU is a high capacity and high efficicency memory unit, made from a photopolymer based thick holographic material called Memplex  , developed by the Laser Photonics Tehnology of Amherst, NY (13) . This material can have a very high M # (>20), and at room temperature, holograms written in this material may survive many years without noticeable degradation (14,15) . The HMU can acieve a huge memory capacity by optimizing its full volume.…”

Section: Super-parallel Holographic Optical Correlatormentioning

confidence: 99%

Shared-hardware alternating operation of a superparallel holographic optical correlator and a superparallel holographic RAM

Andrews

Shahriar²,

Tripathi³

et al. 2004

SPIE Proceedings

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For practical pattern recognition and tracking systems, it is often useful to have a high-speed random access memory (RAM), which complements a holographic correlator. Recently, we have demonstrated a super-parallel holographic optical correlator, which uniquely identifies N images from a database using only 2 N number of detector elements. In this paper, we show how this correlator architecture, operated in reverse, may be used to realize a super-parallel holographic random access memory. We present preliminary results establishing the feasibility of the super-parallel holographic random access memory, and show that essentially the same set of hardware can be operated either as the super-parallel holographic optical correlator or as a super-parallel holographic random access memory, with a minor reorientation of some of the elements in real time. This hybrid device thus eliminates the need for a separate random access memory for a holographic correlator based target recognition and tracking system.

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“…The refracted angle in the sample is 0'. The electric field of the incident wave is written as the vector matrix form If a holographic volume grating with a lattice vector of period x0 K = [Kr,K, KzJ = 2ic [cos cos(, cos4c sin, sincJ /x0 (2) is present, the reflective and transmitted diffracted beams will occur at special angles and 6 respectively while the ordinary reflective and transmissive beams still exist. Inside the sample, 0 <z < a, the electromagnetic field can be written in a general form as…”

Section: Diffracted Electromagnetic Fieldsmentioning

confidence: 99%

Polarization of holographic volume grating diffraction

Nee

2003

SPIE Proceedings

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The full polarization property of a holographic volume grating sample is investigated both theoretically and experimentally. There exists strong interaction between the transmitted and diffracted beams due to the grating diffraction of orders m = -1 and 1. Based upon a volume grating model, the diffracted fields and Mueller matrices of the interacting transmitted and diffracted beams were first analytically derived. The formalism is derived for the general case that the diffraction beam and the grating wave-vector are not in the plane of incidence, where s-waves and p-waves are not de-coupled. For a single-hologram grating sample, the Mueller matrix is measured at wavelength 632.8 nm and in good agreement with the theory. The result demonstrates a correlation between the diffraction strength and the polarization properties of the volume holographic grating. The derived algorithm has provided a simulation analysis tool for the engineering device design of real holographic beam combiner/splitter (HBCS) devices.

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Coherent and incoherent beam combination using thick holographic substrates

Cited by 24 publications

References 15 publications

All optical three dimensional spatio-temporal correlator for automatic event recognition using a multiphoton atomic system

All optical three dimensional spatio-temporal correlator for automatic event recognition using a multiphoton atomic system

Shared-hardware alternating operation of a superparallel holographic optical correlator and a superparallel holographic RAM

Polarization of holographic volume grating diffraction

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