Liquid crystal based active optics

Bagwell, Brett E.; Wick, David V.; Batchko, Robert G.; Mansell, Justin D.; Martínez, Ty; Restaino, Sergio R.; Payne, Don M.; Harriman, Jamie; Serati, Steven A.; Sharp, Gary D.; Schwiegerling, Jim

doi:10.1117/12.694891

Cited by 21 publications

(12 citation statements)

References 10 publications

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“…Traditional active elements, such as spatial light modulators (SLMs) and deformable membrane mirrors, are typically a few centimeters in diameter. Both have been successfully employed in non-mechanical zoom systems [1,2], where two active devices working in conjunction produce optical zoom in lieu of large axial elemental movements. Deformable membrane mirrors have also been used to correct wavefront aberrations of several microns and are commercially available from several firms [3].…”

Section: Introductionmentioning

confidence: 99%

Actuation for carbon fiber reinforced polymer active optical mirrors

Jungwirth

Wick

Baker³

et al. 2012

2012 IEEE Aerospace Conference

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Adaptive or active elements can alter their shape to remove aberrations or shift focal points. Carbon fiber reinforced polymer (CFRP) material improves upon current active mirror materials, such as Zerodur, in several ways: low stiffness-to-weight ratio, very low hysteresis, and greater dynamic range of correction. In this paper, we present recent developments in CFRP mirror actuation, i.e., changing the mirror's shape in an accurate and repeatable fashion. Actuation methods are studied both theoretically, using finite element analysis, and experimentally, using interferometric testing. We present results using two annular rings to push against the mirror's back, producing a wavefront with less than 20 waves of total error. Applications for this work include active telescope secondaries, phase diversity, and adaptive zoom systems.

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Section: Introductionmentioning

confidence: 99%

Actuation for carbon fiber reinforced polymer active optical mirrors

Jungwirth

Wick

Baker³

et al. 2012

2012 IEEE Aerospace Conference

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“…Various LC lens structures have been reported. The LC lens [14] proposed in 2004 by some of the authors (MY, BW, SS) is of simple structure and low optical aberrations and has been applied to optical imaging systems [22][23][24][25][26][27]. By replacing the substrate between the patterned electrode and the LC layer with a thin insulator layer coated with a resistive film, very low driving voltages of approximate 3 V have been realized [28], and applications of the LC lens in camera systems in mobile devices become more and more feasible.…”

Section: Introductionmentioning

confidence: 99%

Focus tuning by liquid crystal lens in imaging system

Wang

Uchida

et al. 2012

Appl. Opt.

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A quantitative study of the focus tuning by a liquid crystal lens in an imaging system composed of a camera module and the liquid crystal lens that performs the focusing function is reported. The resolving capability of the imaging system is investigated by analyzing the image of an ISO12233 chart formed by the system. Measurements show that with the focus tuning by the liquid crystal lens, the resolving power of the system can be very close to that of the camera module.

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“…16,17,[19][20][21][22] However, most research has been focused so far on the experimental demonstration of the basic principle using off-the-shelf components, without much concern for the practicality or the optical performance of the systems.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of wide-angle foveated optical systems based on transmissive liquid crystal spatial light modulators

Harvey

2009

Opt. Eng

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Optical foveated imaging using liquid crystal ͑LC͒ spatial light modulators ͑SLMs͒ has received considerable attention in recent years as a potential approach to reducing size and complexity in fast wideangle lenses. We cover a theoretical study quantifying the diffraction efficiency and image quality of foveated optical systems ͑FOSs͒ based on transmissive LC SLMs. A practical design example of a fast wideangle FOS based on the current transmissive LC SLM technology is proposed.

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Liquid crystal based active optics

Cited by 21 publications

References 10 publications

Actuation for carbon fiber reinforced polymer active optical mirrors

Actuation for carbon fiber reinforced polymer active optical mirrors

Focus tuning by liquid crystal lens in imaging system

Analysis and design of wide-angle foveated optical systems based on transmissive liquid crystal spatial light modulators

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