Wavelength-agile telescope system with diffractive wavefront control and acousto-optic spectral filter

Gruneisen, Mark T.; Dymale, Raymond C.; Rotge, James R.; Lubin, Donald L.; Voelz, David G.; Deramo, Melinda

doi:10.1117/12.561732

Cited by 4 publications

(4 citation statements)

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“…Previous efforts at nonmechanical spectral filtering in an adaptive optical imaging system utilized acousto-optic tunable filters (AOTF) [8]. Wavelength selectivity was accomplished via diffraction from a variable frequency acoustic standing wave.…”

Section: Spectral Filtersmentioning

confidence: 99%

Radical advancement in multi-spectral imaging for autonomous vehicles (UAVs, UGVs, and UUVs) using active compensation.

Clark¹,

Bagwell²,

Wick³

2007

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The purpose of this LDRD was to demonstrate a compact, multi-spectral, refractive imaging systems using active optical compensation. Compared to a comparable, conventional lens system, our system has an increased operational bandwidth, provides for spectral selectivity and, non-mechanically corrects aberrations induced by the wavelength dependent properties of a passive refractive optical element (i.e. lens). The compact nature and low power requirements of the system lends itself to small platforms such as autonomous vehicles. In addition, the broad spectral bandwidth of our system would allow optimized performance for both day/night use, and the multi-spectral capability allows for spectral discrimination and signature identification.

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Section: Spectral Filtersmentioning

confidence: 99%

Radical advancement in multi-spectral imaging for autonomous vehicles (UAVs, UGVs, and UUVs) using active compensation.

Clark¹,

Bagwell²,

Wick³

2007

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“…18 Wavelength selectivity is accomplished via diffraction from a variable frequency acoustic standing wave. The advantages of such a device are tunability and narrow pass band.…”

Section: 2mentioning

confidence: 99%

Adaptive optical zoom sensor.

Sweatt¹,

Bagwell²,

Wick³

2005

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In order to optically vary the magnification of an imaging system, continuous mechanical zoom lenses require multiple optical elements and use fine mechanical motion to precisely adjust the separations between individual or groups of lenses.1 By incorporating active elements into the optical design, we have designed and demonstrated imaging systems that are capable of variable optical magnification with no macroscopic moving parts.2-3 Changing the effective focal length and magnification of an imaging system can be accomplished by adeptly positioning two or more active optics in the optical design and appropriately adjusting the optical power of those elements. In this application, the active optics (e.g. liquid crystal spatial light modulators or deformable mirrors) serve as variable focal-length lenses.4-7 Unfortunately, the range over which currently available devices can operate (i.e. their dynamic range) is relatively small. Therefore, the key to this concept is to create large changes in the effective focal length of the system with very small changes in the focal lengths of individual elements by leveraging the optical power of conventional optical elements surrounding the active optics. By appropriately designing the optical system, these variable focal-length lenses can provide the flexibility necessary to change the overall system focal length, and therefore magnification, that is normally accomplished with mechanical motion in conventional zoom lenses.

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“…However, vibration, thermal expansion, mechanical stress, and manufacturing imperfections can seriously reduce the performance of the primary mirror and introduce large aberrations to the telescope. [1][2][3] An active wavefront correction system that can compensate for the aberration is important. A schematic of the proposed laser communication transmitter with such an active wavefront control system is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…14 Gruneisen the diffraction efficiency, dynamic range of correction, efficiency for correcting large defocus and astigmatism, and the wavelength dependence of such a system using a Fourier optics approach. [1][2][3] Also, Gruneisen et al have addressed the efficiency issue associated with the local wavefront slope needed for large correction. In this paper, we give a comprehensive analysis of a wavefront correction system using a LC-SLM, considering the aberration being corrected, the resolution of the correction device, and the LC-SLM efficiency.…”

Section: Introductionmentioning

confidence: 99%

Modeling and performance limits of a large aperture high-resolution wavefront control system based on a liquid crystal spatial light modulator

Wang

Bos

et al. 2007

Opt. Eng

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The aberration introduced by the primary optical element of a lightweight large aperture telescope can be corrected with a diffractive optical element called the liquid crystal spatial light modulator. Such aberration is usually very large, which makes the design and modeling of such a system difficult. A method to analyze the system is introduced, and the performance limitation of the system is studied through extensive modeling. An experimental system is demonstrated to validate the analysis. The connection between the modeling data and the experimental data is given.

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Wavelength-agile telescope system with diffractive wavefront control and acousto-optic spectral filter

Cited by 4 publications

References 0 publications

Radical advancement in multi-spectral imaging for autonomous vehicles (UAVs, UGVs, and UUVs) using active compensation.

Radical advancement in multi-spectral imaging for autonomous vehicles (UAVs, UGVs, and UUVs) using active compensation.

Adaptive optical zoom sensor.

Modeling and performance limits of a large aperture high-resolution wavefront control system based on a liquid crystal spatial light modulator

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