David A. Glenar, John J. Hillman, Babak Saif, and Jay Bergstralh, "Acousto-optic imaging spectropolarimetry for remote sensing," Appl. Opt. 33, 7412-7424 (1994)
We review the operating principles of noncollinear acousto-optic tunable filters (AOTF’s), emphasizing use of two orthogonally polarized beams for narrow-band imaging. Spectral characterization and the spectral broadening measurements of commercially available AOTF’s agree with theoretical predictions and reveal difficulties associated with imaging noncollimated light. An AOTF imaging spectropolarimeter for ground-based astronomy that uses CCD’s has been constructed at NASA Goddard Space Flight Center. It uses a TeO2 noncollinear AOTF and a simple optical relay assembly to produce side-by-side orthogonally polarized spectral images. We summarize the instrument design and initial performance tests. We include sample spectral images acquired at the Goddard Geophysical and Astronomical Observatory.
Denis A. Belyaev, Konstantin B. Yushkov, Sergey P. Anikin, Yuri S. Dobrolenskiy, Aleksander Laskin, Sergey N. Mantsevich, Vladimir Ya. Molchanov, Sergey A. Potanin, and Oleg I. Korablev Opt. Express 25(21) 25980-25991 (2017)
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AOTF 1 was manufactured by Brimrose Corp.; AOTF 2 was manufactured by AOTF Technology, Inc.
This is defined as R = λ/δλ and is measured in collimated light.
This is near the central wavelength and is constrained to 7–8° by the fixed instrument design.
This is the single polarization efficiency in the optimized beam; it is defined as the ratio of peak output transmittance to polarized light at the device input.
See definitions in the text.
Focal ratios faster than f/13 introduce scattered light into the diffracted beams.
This is for the optics listed, defined as 1.22 × λ/DA, λ = 700 nm.
The signal-to-noise ratio is 3, integration time τ is 10 s, and transmittance of optics and atmosphere is 0.2. See text for additional assumptions.
Tables (4)
Table 1
Typical Specifications for Commercial TeO2 AOTF’s (Refs. 1, 4, and 5)
AOTF 1 was manufactured by Brimrose Corp.; AOTF 2 was manufactured by AOTF Technology, Inc.
This is defined as R = λ/δλ and is measured in collimated light.
This is near the central wavelength and is constrained to 7–8° by the fixed instrument design.
This is the single polarization efficiency in the optimized beam; it is defined as the ratio of peak output transmittance to polarized light at the device input.
See definitions in the text.
Focal ratios faster than f/13 introduce scattered light into the diffracted beams.
This is for the optics listed, defined as 1.22 × λ/DA, λ = 700 nm.
The signal-to-noise ratio is 3, integration time τ is 10 s, and transmittance of optics and atmosphere is 0.2. See text for additional assumptions.