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

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

doi:10.1117/1.2829768

1 January 2008 Operational characteristics of a long-wavelength IR multispectral imager based on an acousto-optic tunable filter

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

Author Affiliations +

Optical Engineering, Vol. 47, Issue 1, 013201 (January 2008). https://doi.org/10.1117/1.2829768

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.

©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Narsingh B. Singh, David A. Kahler, David J. Knuteson, M. Gottlieb, D. Suhre, Andre Berghmans, Brian Wagner, Jerry Hedrick, Thomas J. Karr, and Jack J. Hawkins "Operational characteristics of a long-wavelength IR multispectral imager based on an acousto-optic tunable filter," Optical Engineering 47(1), 013201 (1 January 2008). https://doi.org/10.1117/1.2829768

Published: 1 January 2008

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