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  • Optics  (5)
  • 1
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    Polarization Compensation of Fresnel Aberrations in Telescopes (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Large aperture space telescopes are built with low F# s to accommodate the mechanical constraints of launch vehicles and to reduce resonance frequencies of the on-orbit system. Inherent with these low F# s is Fresnel polarization which affects image quality. We present the design and modeling of a nano-structure consisting of birefringent layers to control polarization and increase contrast. Analysis shows a device that functions across a 400nm bandwidth tunable from 300nm to 1200nm. This Fresnel compensator device has a cross leakage of less than 0.001 retardance.
    Keywords: Optics
    Type: NF1676L-12395 , 2011 SPIE Optics and Photonics; Aug 21, 2011 - Aug 25, 2011; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Intelligent Optical Systems Using Adaptive Optics (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Until recently, the phrase adaptive optics generally conjured images of large deformable mirrors being integrated into telescopes to compensate for atmospheric turbulence. However, the development of smaller, cheaper devices has sparked interest for other aerospace and commercial applications. Variable focal length lenses, liquid crystal spatial light modulators, tunable filters, phase compensators, polarization compensation, and deformable mirrors are becoming increasingly useful for other imaging applications including guidance navigation and control (GNC), coronagraphs, foveated imaging, situational awareness, autonomous rendezvous and docking, non-mechanical zoom, phase diversity, and enhanced multi-spectral imaging. The active components presented here allow flexibility in the optical design, increasing performance. In addition, the intelligent optical systems presented offer advantages in size and weight and radiation tolerance.
    Keywords: Optics
    Type: NF1676L-14298 , CIMTEC 4th International Conference Smart Materials Structures Systems 2012; Jun 10, 2012 - Jun 14, 2012; Montecatini Terme; Italy
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    NASA TECHNICAL REPORTS
  • 3
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    Optical Characterization of Window Materials for Aerospace Applications (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An optical metrology laboratory has been developed to characterize the optical properties of optical window materials to be used for aerospace applications. Several optical measurement systems have been selected and developed to measure spectral transmittance, haze, clarity, birefringence, striae, wavefront quality, and wedge. In addition to silica based glasses, several optical lightweight polymer materials and transparent ceramics have been investigated in the laboratory. The measurement systems and selected empirical results for non-silica materials are described. These measurements will be used to form the basis of acceptance criteria for selection of window materials for future aerospace vehicle and habitat designs.
    Keywords: Optics
    Type: NF1676L-17076 , SPIE Optifab 2013; Oct 14, 2013 - Oct 17, 2013; Rochester, NY; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Advanced Optical Technologies for Space Exploration (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA Langley Research Center is involved in the development of photonic devices and systems for space exploration missions. Photonic technologies of particular interest are those that can be utilized for in-space communication, remote sensing, guidance navigation and control, lunar descent and landing, and rendezvous and docking. NASA Langley has recently established a class-100 clean-room which serves as a Photonics Fabrication Facility for development of prototype optoelectronic devices for aerospace applications. In this paper we discuss our design, fabrication, and testing of novel active pixels, deformable mirrors, and liquid crystal spatial light modulators. Successful implementation of these intelligent optical devices and systems in space, requires careful consideration of temperature and space radiation effects in inorganic and electronic materials. Applications including high bandwidth inertial reference units, lightweight, high precision star trackers for guidance, navigation, and control, deformable mirrors, wavefront sensing, and beam steering technologies are discussed. In addition, experimental results are presented which characterize their performance in space exploration systems.
    Keywords: Optics
    Type: SPIE Optics and Photonics 2007; Aug 26, 2007 - Aug 30, 2007; San Diego, CA; United States
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    NASA TECHNICAL REPORTS
  • 5
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    Design and Performance Evaluation of Sensors and Actuators for Advanced Optical Systems (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Current state-of-the-art commercial sensors and actuators do not meet many of NASA s next generation spacecraft and instrument needs. Nor do they satisfy the DoD needs for satellite missions, especially micro/nano satellite missions. In an effort to develop advanced optical devices and instruments that meet mission requirements, NASA Langley recently completed construction of a new cleanroom housing equipment capable of fabricating high performance active optic and adaptive optic technologies including deformable mirrors, reconfigurable lenses (both refractive and diffractive), spectrometers, spectro-polarimeters, tunable filters and many other active optic devices. In addition to performance, these advanced optic technologies offer advantages in speed, size, weight, power consumption, and radiation tolerance. The active optic devices described in this paper rely on birefringent liquid crystal materials to alter either the phase or the polarization of the incoming light. Design considerations and performance evaluation results for various NASA applications are presented. Applications presented will include large space telescopes, optical communications, spacecraft windows, coronagraphs, and star trackers. Keywords: Photonics, Adaptive Optics, Tunable Filters, MEMs., MOEMs, Coronagraph, Star Tracker
    Keywords: Optics
    Type: NF1676L-12300 , SPIE Smart Structures and NDE Conference; Mar 06, 2011 - Mar 10, 2011; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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