Spectral characterization of acousto-optic filters used in imaging spectroscopy

Georgiev, Georgi; Glenar, D. A.; Hillman, J. J.

doi:10.1364/ao.41.000209

Cited by 68 publications

(39 citation statements)

References 14 publications

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“…A non-collinear device is one where the input light beam and the RF acoustic wave are not aligned. Thanks to recent advancements in non-collinear AOTF technology these devices now have relatively high efficiency and robust imaging quality (Georgiev et al, 2002;Voloshinov et al, 2007).…”

Section: Acousto-optical Tunable Filtermentioning

confidence: 99%

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

et al. 2016

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Abstract. The Aerosol Limb Imager (ALI) is an optical remote sensing instrument designed to image scattered sunlight from the atmospheric limb. These measurements are used to retrieve spatially resolved information of the stratospheric aerosol distribution, including spectral extinction coefficient and particle size. Here we present the design, development and test results of an ALI prototype instrument. The longterm goal of this work is the eventual realization of ALI on a satellite platform in low earth orbit, where it can provide high spatial resolution observations, both in the vertical and cross-track. The instrument design uses a large-aperture acousto-optic tunable filter (AOTF) to image the sunlit stratospheric limb in a selectable narrow wavelength band ranging from the visible to the near infrared. The ALI prototype was tested on a stratospheric balloon flight from the Canadian Space Agency (CSA) launch facility in Timmins, Canada, in September 2014. Preliminary analysis of the hyperspectral images indicates that the radiance measurements are of high quality, and we have used these to retrieve vertical profiles of stratospheric aerosol extinction coefficient from 650 to 1000 nm, along with one moment of the particle size distribution. Those preliminary results are promising and development of a satellite prototype of ALI within the Canadian Space Agency is ongoing.

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Section: Acousto-optical Tunable Filtermentioning

confidence: 99%

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

et al. 2016

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“…where C o0 = 3.71789, C o1 = 0.07544, C o2 = 0.19619, C o3 = 4.61196 and C e0 = 4.33449, C e1 = 0.14739, C e2 = 0.20242, C e3 = 4.93667 for TeO 2 from 0.4 um to 3.5 um [13]. The acoustic wave phase propagation angle α is given by…”

Section: A Tuning Curve Under the Parallel Tangential Conditionmentioning

confidence: 99%

“…Though the tuning curves for both incident polarizations are independent on the exit facet wedge angle θ cw from (7), (12) and (13), the tested tuning curve optimization method can also be applied to θ cw . We can rotate the AOTF to make the exit facet instead of the incident directly normal to the incident light as in Fig.7.…”

Section: Measurement Of the Exit Wedge Anglementioning

confidence: 99%

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Crystal geometry measurement of an acousto-optic tunable filter using the tested tuning curves

Zhao

Zhang

et al. 2012

2012 8th IEEE International Symposium on Instrumentation and Control Technology (ISICT) Proceedings

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A simple method of measuring the actual crystal geometry of an acousto-optic tunable filter (AOTF) was proposed. The relations between the tuning curves and the geometry were exactly analyzed for both incident polarizations. Through two optimization algorithms, the acoustic wave phase propagation angle and the incident facet angle were computed from the tested tuning curves successively. The exit wedge angle was measured similarly by swapping the incident and exit facets. A well fabricated 430 ∼ 785 nm AOTF with known designed transducer cut angle 9.5 • was chosen for experiment. The actual three angles were successfully measured. To verify this method, another experiment of measuring the non-diffracted light deflection angle was conducted. Its result highly approached the theoretical value calculated by the measured crystal geometry. This method is useful to establish the AOTF ray tracing model for optic design and to evaluate the AOTF performance by comparing with the designed geometry.

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“…Three noncollinear filters functioning over the spectral range of 0.5 to 3.5 μm were characterized in Ref. 9. Two of the filters were used for imaging applications over different wavelength ranges.…”

Section: Introductionmentioning

confidence: 99%

Infrared acousto-optic tunable filter point spectrometer for detection of organics on mineral surfaces

et al. 2013

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Abstract. A prototype infrared (IR) acousto-optic tunable filter (AOTF)-based point spectrometer has been designed for examining and analyzing potential biological samples collected in situ from the planets or other solar system objects. The reflectance spectrometer operates at a wavelength range of 1.6 to 3.6 μm, which is diagnostic of minerals and organics, and inspects a 1-mm sized spot on the sample. The tuning component is the AOTF that has been utilized in a variety of spectral detection applications. The instrument's specification and design approach including the selected components is described. The data acquisition system, the electronic components, and their interconnections are presented. The instrument's radiometric performance is examined and described by a noise equivalent reflectance value of 0.13% that is obtained from the laboratory measurements. The device has been demonstrated by measuring the reflectance spectra for a variety of geological samples and comparing the results with the United States Geological Survey data. © The Authors.Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Spectral characterization of acousto-optic filters used in imaging spectroscopy

Cited by 68 publications

References 14 publications

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

Crystal geometry measurement of an acousto-optic tunable filter using the tested tuning curves

Infrared acousto-optic tunable filter point spectrometer for detection of organics on mineral surfaces

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