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Optical Engineering

Operational characteristics of a long-wavelength IR multispectral imager based on an acousto-optic tunable filter
Author(s): Narsingh B. Singh; David A. Kahler; David J. Knuteson; M. Gottlieb; D. Suhre; Andre Berghmans; Brian Wagner; Jerry Hedrick; Thomas J. Karr; Jack J. Hawkins
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Paper Abstract

We have experimentally demonstrated and report on the results of crystal growth, fabrication, design, development, and performance for the long-wavelength infrared (LWIR) hyperspectral imager based on an acousto-optic tunable filter (AOTF) utilizing an efficient crystal, thallium arsenic selenide (Ti3AsSe3 TAS). Results on the growth of 40-mm-diameter, 15-cm-long crystal boules, to fabricate 4.0-cm-long AOTF devices, and on the system design and performance are presented. To achieve an 8-cm-1-resolution AOTF, we developed a design utilizing growth at 10.6 deg off from the c axis of the crystal and achieved >37% efficiency. A system concept was developed with high efficiency, resolution, and throughput utilizing this TAS AOTF. The test setup consisted of an LWIR camera (microbolometer), the AOTF, and a blackbody radiative source (hot filament), and represents the first time AOTF imaging has been achieved with a microbolometer camera. The filament was placed ≈25 cm in front of the AOTF, and the camera was aligned to the first-order diffracted beam of the AOTF. The AOTF was tuned to 10.6-μm wavelength by applying a 13.9-MHz rf signal to the transducer. Preliminary experimental results obtained for SF6 gas utilizing this system are reported.

Paper Details

Date Published: 1 January 2008
PDF: 5 pages
Opt. Eng. 47(1) 013201 doi: 10.1117/1.2829768
Published in: Optical Engineering Volume 47, Issue 1
Show Author Affiliations
Narsingh B. Singh, Northrop Grumman Corp. (United States)
David A. Kahler, Northrop Grumman Corp. (United States)
David J. Knuteson, Northrop Grumman Corp. (United States)
M. Gottlieb, Northrop Grumman Corp. (United States)
D. Suhre, Northrop Grumman Corp. (United States)
Andre Berghmans, Northrop Grumman Corp. (United States)
Brian Wagner, Northrop Grumman Corp. (United States)
Jerry Hedrick, Northrop Grumman Corp. (United States)
Thomas J. Karr, Northrop Grumman Corp. (United States)
Jack J. Hawkins, Northrop Grumman Corp. (United States)


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