Digital electronics meets its match (acoustooptic devices)

Goutzoulis, Anastasios P.; Abramovitz, I. J.

doi:10.1109/6.7159

Cited by 16 publications

(7 citation statements)

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“…If we choose lens L 2 so that its focal length satisfies the condition fl/f2 = Asound/Afringe, (12) the telescopic magnification of the lens system will be the inverse of the magnification described in Subsection 3.A and the computed object will be displayed with no distortion. Equations (7)- (9) are valid regardless of the holographic image's position with respect to the AOM because the horizontal scanning plane coincides with the focal plane of lens L1.…”

Section: A Aom As a Dynamic Hologrammentioning

confidence: 99%

Synthetic aperture holography: a novel approach to three-dimensional displays

1992

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We describe an electro-optic apparatus capable of displaying a computer-generated hologram in real time. The computer-generated hologram is calculated by a supercomputer, read from a fast frame buffer, and transmitted to a wide-bandwidth acousto-optic modulator. Coherent light is modulated by the acousto-optic modulator and optically processed to produce a three-dimensional image with horizontal parallax. We evaluate different display geometries and their effect on the optical parameters of the system. We then show how the display resolution can be increased by simultaneously writing three acoustic columns on a single crystal and optically multiplexing the resulting holograms. We finally describe some improvements that follow from the analysis.

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Section: A Aom As a Dynamic Hologrammentioning

confidence: 99%

Synthetic aperture holography: a novel approach to three-dimensional displays

1992

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“…One-dimensional SAW-based AO correlators are employed in air-borne passive ranging to locate the range of a jamming source. These can operate with bandwidth B = 100 MHz, with signal integration over 5t020 ms, with time resolution of less than 10 ns [227]. A 2-D AO correlator has also been employed to cover a bandwidth B = 60 MHz, with signal integration over a 30-ms period.…”

Section: Sa W-based Acoustooptic Convolvers and Correlatorsmentioning

confidence: 99%

“…A 2-D AO correlator has also been employed to cover a bandwidth B = 60 MHz, with signal integration over a 30-ms period. This device can detect radar returns with SIN ratios of -60 dB, with Doppler resolution of 30 Hz [227].…”

Section: Sa W-based Acoustooptic Convolvers and Correlatorsmentioning

confidence: 99%

Applications of surface acoustic and shallow bulk acoustic wave devices

Campbell

1989

Proc. IEEE

112

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Applications of surface acoustic wave (SA W) and shallow bulk acoustic wave (SBA W) devices are reviewed. SA W-device coverage includes delay lines and filters operating at selected frequencies in the range from about 10 MHz to 11 GHz, modeling with singlecrystal piezoelectrics and layered structures, resonators and lowloss filters, comb filters and multiplexers, antenna duplexers, harmonic devices, chirp filters for pulse compression, coding with fixed and programmable transversal filters, Barker and quadraphase coding, adaptive filters, acoustic and acoustoelectric convolvers and correia tors for radar, spread spectrum, and packet radio, acoustooptic processors for Bragg modulation and spectrum analysis, real-time Fourier-transform, and cepstrum processors for radar and sonar, compressive receivers, Nyquist filters for microwave digital radio, clock-recovery filters for optical fiber communications, fixed-, tunable-, and multimode-oscillators, and frequency synthesizers, acoustic charge transport (ACT), and other SA W devices for signal processing on gallium arsenide, SA W sensors, and scanning acoustic microscopy. SBA W-devices applications include gigahertz delay lines, surface transverse wave resonators employing energy-trapping gratings, as well as oscillators with enhanced performance and capability.

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“…Continuum correlators currently in use have a maximum input passband of -•0.5 GHz [Padin et al, 1991], while future sensitivity requirements will make it attractive to correlate over a 10-GHz or greater bandwidth. A continuum correlator with an input passband of 10 GHz or more is currently unattainable in a single channel using digital electronics [Goutzoulis and Abramovitz, 1988] or acousto-optic devices [Tsai, 1990]. On the other hand, commercially available electro-optic devices, such as Mach-Zehnder interferometric modulators (MZIMs) [see Iizuka, 1987], currently achieve bandwidths of 18 GHz: adequate, in principle, to fulfill the future requirements of millimeter-wave interferometry.…”

Section: Introductionmentioning

confidence: 99%

Linear electro‐optic effect applied to a radio astronomy correlator

Price¹,

Kronberg²,

Iizuka³

et al. 1996

Radio Science

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Studies of weak millimeter-wave cosmic radio sources in the next generation of millimeter interferometers will, for optimal sensitivity to continuum radio sources, require continuum cross correlators with an input passband of approximately 10 GHz, in comparison to the 500 MHz devices presently installed. We have designed and tested an optoelectronic continuum correlator which can achieve such high bandwidths using integrated optic Mach-Zehnder interferometric modulators (to convert the IF signals from the radio telescope receivers to optical signals) and photoreceivers (to convert the optical signals back to electrical signals). A prototype real-channel continuum correlator of this type is described. It performs with an overall efficiency of 81 +__ 3%, which compares favorably with typical electronic digital and analogue correlators currently used in radio astronomy. For the latter, which are seen in the early universe at high redshifts, the broadband thermal radiation emitted then might be detectable now at millimeter and submillimeter bands, since it would be redshifted by a factor of 10 or so.Most types of cosmic radiation at millimeter wavelengths are very faint. Nonthermal synchrotron emission, which is strongly emitted at centimeter wavelengths by cosmic rays in supernovae radio galaxies and quasars, becomes very weak at millimeter wavelengths. Other types of continuum radiation at millimeter wavelengths are thermal bremsstrahlung and thermal emission from cosmic

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Digital electronics meets its match (acoustooptic devices)

Cited by 16 publications

References 0 publications

Synthetic aperture holography: a novel approach to three-dimensional displays

Synthetic aperture holography: a novel approach to three-dimensional displays

Applications of surface acoustic and shallow bulk acoustic wave devices

Linear electro‐optic effect applied to a radio astronomy correlator

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