Dr. Dennis R. Suhre Profile

Dr. Dennis R. Suhre

Vice President at DRS Scientific Inc

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Publications (17)

SPIE Journal Paper | 20 July 2017

Effects of sidelobes on acousto-optic tunable filter imaging

Neelam Gupta, Dennis Suhre

OE, Vol. 56, Issue 07, 073106, (July 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.7.073106

KEYWORDS: Acousto-optics, Tunable filters, Imaging systems, Hyperspectral imaging, Infrared imaging, Infrared radiation, Image transmission, Ultraviolet radiation, Long wavelength infrared, Transducers

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Proceedings Article | 16 February 2017 Presentation + Paper

Sidelobe considerations in AOTF imaging

Neelam Gupta, Dennis Suhre

Proceedings Volume 10100, 101000L (2017) https://doi.org/10.1117/12.2252277

KEYWORDS: Hyperspectral imaging, Imaging systems, Short wave infrared radiation, Transducers, Acoustics, Crystals, Semiconductor lasers, Cameras, Confocal optics, Optical filters

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An acousto-optic tunable filter (AOTF) is an all solid-state robust device with no-moving parts that has been used in the development of hyperspectral imagers from the ultraviolet to the longwave infrared. Such a device is fabricated by bonding a piezoelectric transducer on a specially cut prism in a birefringent crystal. When a radio frequency (RF) signal is applied to the transducer, a diffraction grating is set up in the crystal with grating period determined by the applied RF and the diffracted wavelength depends upon the applied RF and the prism parameters. When broadband white light is incident on the prism input facet, two orthogonally polarized diffracted beams at a specific wavelength with a narrow bandpass are transmitted for each applied RF. The transmitted wavelength can be tuned by varying the applied RF and this is used in a hyperspectral imager design. The spectral response of the transmitted intensity from an AOTF with a rectangular transducer has a sinc² distribution with a main lobe and a large number of sidelobes. In general, in hyperspectral imaging applications the light leakage from the sidelobes is not taken into account. When imaging is carried out for a scene with a laser or an intense source of light, the spectral images are affected by the light transmitted through these sidelobes away from the main lobe. We have carried out a detailed study of light transmitted through the sidelobes of a TeO₂ AOTF with a rectangular transducer operating in the shortwave infrared (SWIR) region from 0.9 to 1.7 μm. The AOTF imaging system used a telecentric confocal optics that compensates for AOTF aberrations, which are severe at high sidelobe operation. We used a 16-channel RF driver with independent amplitude and frequency control. By switching off specific RF signals applied to the AOTF, we measured the detailed sidelobe structure for the transmitted intensity by analyzing the spectral images and compared it with theoretical prediction. Here we present our experimental setup and results.

Proceedings Article | 31 May 2013 Paper

Acousto-optical imagers for chemical and biological detection: growth and characterization of Hg2Cl2-xBrx crystals

N. Singh, Milton Gottlieb, Dennis Suhre, Tahira Raja, Bradley Arnold, Mohan Singh, David Machuga

Proceedings Volume 8719, 87190V (2013) https://doi.org/10.1117/12.2014937

KEYWORDS: Crystals, Acousto-optics, Acoustics, Imaging systems, Solids, Transducers, Crystal optics, Long wavelength infrared, Crystallography, Image processing

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Proceedings Article | 27 August 2008 Paper

High efficiency LWIR AOTF

D. Kahler, N. Singh, M. Gottlieb, D. Suhre, P. Lucey, D. Knuteson, A. Berghmans, B. Wagner, S. McLaughlin

Proceedings Volume 7086, 70860L (2008) https://doi.org/10.1117/12.792561

KEYWORDS: Crystals, Long wavelength infrared, Transducers, Black bodies, Imaging systems, Imaging spectroscopy, Polishing, Acoustics, Acousto-optics, Tunable filters

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SPIE Journal Paper | 1 January 2008

Operational characteristics of a long-wavelength IR multispectral imager based on an acousto-optic tunable filter

Narsingh Singh, David Kahler, David Knuteson, M. Gottlieb, D. Suhre, Andre Berghmans, Brian Wagner, Jerry Hedrick, Thomas Karr, Jack Hawkins

OE, Vol. 47, Issue 01, 013201, (January 2008) https://doi.org/10.1117/12.10.1117/1.2829768

KEYWORDS: Crystals, Long wavelength infrared, Imaging systems, Acousto-optics, Thallium, Transducers, Cameras, Mercury, Acoustics, Infrared imaging

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SPIE Journal Paper | 1 June 2007

Crystal growth, fabrication, and design of mercurous bromide acousto-optic tunable filters

David Knuteson, Narsingh Singh, M. Gottlieb, D. Suhre, Neelam Gupta, Andre Berghmans, David Kahler, Brian Wagner, Jack Hawkins

OE, Vol. 46, Issue 06, 064001, (June 2007) https://doi.org/10.1117/12.10.1117/1.2744369

KEYWORDS: Crystals, Acousto-optics, Mercury, Bromine, Transducers, Acoustics, Tunable filters, X-rays, Polishing, Single crystal X-ray diffraction

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Proceedings Article | 26 April 2007 Paper

Operational characteristics of LWIR AOTF based multispectral imager

N. Singh, M. Gottlieb, D. Suhre, D. Kahler, D. Knuteson, A. Berghmans, B. Wagner, J. Hedrick, T. Karr, J. Hawkins

Proceedings Volume 6554, 65540E (2007) https://doi.org/10.1117/12.721516

KEYWORDS: Crystals, Long wavelength infrared, Transducers, Imaging systems, Acousto-optics, Thallium, Cameras, Acoustics, Microbolometers, Gas lasers

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SPIE Journal Paper | 1 September 2006

Properties of nonlinear optical crystals in the terahertz wavelength region

Narsingh Singh, Theodore Norris, T. Buma, R. N. Singh, M. Gottlieb, D. Suhre, Jack Hawkins

OE, Vol. 45, Issue 09, 094002, (September 2006) https://doi.org/10.1117/12.10.1117/1.2349516

KEYWORDS: Terahertz radiation, Crystals, Gases, Thallium, Refractive index, Absorption, Nonlinear crystals, Gallium, Spectroscopy, Optical engineering

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Proceedings Article | 21 September 2005 Paper

Ternary halides: novel NLO compounds for LWIR

N. Singh, D. Suhre, K. Green, N. Fernelius, F. Hopkins

Proceedings Volume 5912, 591203 (2005) https://doi.org/10.1117/12.616612

KEYWORDS: Crystals, Thallium, Transparency, Nonlinear crystals, X-rays, Crystallography, Nonlinear optics, Long wavelength infrared, Mercury, Binary data

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Proceedings Article | 9 September 2005 Paper

Design and fabrication of mercurous bromide acousto-optic filters

D. Knuteson, N. Singh, N. Gupta, M. Gottlieb, D. Suhre, A. Berghmans, D. Thomson, D. Kahler, B. Wagner, J. Hawkins, M. Fitelson

Proceedings Volume 5881, 58810E (2005) https://doi.org/10.1117/12.620115

KEYWORDS: Crystals, Acousto-optics, Mercury, Bromine, Transducers, Tunable filters, X-rays, Long wavelength infrared, Acoustics, Transparency

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SPIE Journal Paper | 1 September 2005

Long-wave infrared spectral imager with an 8-cm^–1 passband acousto-optic tunable filter

Dennis Suhre, Neelam Gupta, Milton Gottlieb

OE, Vol. 44, Issue 09, 094601, (September 2005) https://doi.org/10.1117/12.10.1117/1.2048755

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SPIE Journal Paper | 1 November 2003

Noncollinear optical parametric oscillator design for walk-off reduction in GaSe crystals

Narsingh Singh, Dennis Suhre, Kenton Green, Nils Fernelius, Frank Hopkins

OE, Vol. 42, Issue 11, (November 2003) https://doi.org/10.1117/12.10.1117/1.1614266

KEYWORDS: Gases, Optical parametric oscillators, Crystals, Polishing, Nonlinear crystals, Optical design, Prisms, Selenium, Analytical research, Phase matching

Proceedings Article | 15 November 2000 Paper

Spectropolarimetric imaging using a field-portable imager

Neelam Gupta, Louis Denes, Milton Gottlieb, Dennis Suhre, Boris Kaminsky, Peter Metes

Proceedings Volume 4132, (2000) https://doi.org/10.1117/12.406607

KEYWORDS: Polarization, Imaging systems, Metals, Vegetation, Roads, Polarimetry, Analytical research, Visible radiation, Target detection, Acousto-optics

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Proceedings Article | 27 July 2000 Paper

Progress in AOTF hyperspectral imagers

Neelam Gupta, Rachid Dahmani, Kelly Bennett, S. Simizu, Dennis Suhre, N. Singh

Proceedings Volume 4054, (2000) https://doi.org/10.1117/12.394104

KEYWORDS: Imaging systems, Hyperspectral imaging, Crystals, Long wavelength infrared, Staring arrays, Sensors, Infrared imaging, Thallium, Polarization, Mercury cadmium telluride

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Proceedings Article | 29 January 1999 Paper

Comparison of acousto-optic tunable filters and acousto-optic dispersive filters for hyperspectral imaging

Dennis Suhre, Lyle Taylor, N. Singh, W. Rosch

Proceedings Volume 3584, (1999) https://doi.org/10.1117/12.339816

KEYWORDS: Acousto-optics, Imaging systems, Tunable filters, Acoustics, Image filtering, Infrared radiation, Diffraction, Germanium, Infrared imaging, Crystals

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Proceedings Article | 12 June 1995 Paper

Infrared spectroradiometer design based on an acousto-optic tunable filter

Lyle Taylor, Dennis Suhre, Steve Wutzke, Phil Ulerich, Gary Baldwin, Mark Meyers, Jefferson Odhner

Proceedings Volume 2480, (1995) https://doi.org/10.1117/12.210889

KEYWORDS: Calibration, Signal to noise ratio, Sensors, Modulation transfer functions, Black bodies, Crystals, Acoustics, Target detection, Electrons, Cameras

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SPIE Journal Paper | 1 October 1992

Spatial resolution of imaging noncollinear acousto-optic tunable filters

Dennis Suhre, Milton Gottlieb, Lyle Taylor, Nathan Melamed

OE, Vol. 31, Issue 10, (October 1992) https://doi.org/10.1117/12.10.1117/12.58882

KEYWORDS: Acoustics, Diffraction, Tunable filters, Spatial resolution, Acousto-optics, Imaging systems, Image filtering, Mendelevium, Bandpass filters, Infrared imaging

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Showing 5 of 17 publications

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