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  • 1990-1994  (5)
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  • 1
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    Unknown
    Improved real-time imaging spectrometer (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An improved AOTF-based imaging spectrometer that offers several advantages over prior art AOTF imaging spectrometers is presented. The ability to electronically set the bandpass wavelength provides observational flexibility. Various improvements in optical architecture provide simplified magnification variability, improved image resolution and light throughput efficiency and reduced sensitivity to ambient light. Two embodiments of the invention are: (1) operation in the visible/near-infrared domain of wavelength range 0.48 to 0.76 microns; and (2) infrared configuration which operates in the wavelength range of 1.2 to 2.5 microns.
    Keywords: OPTICS
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Fiber-Optic Terahertz Data-Communication Networks (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Network protocols implemented in optical domain. Fiber-optic data-communication networks utilize fully available bandwidth of single-mode optical fibers. Two key features of method: use of subpicosecond laser pulses as carrier signals and spectral phase modulation of pulses for optical implementation of code-division multiple access as multiplexing network protocol. Local-area network designed according to concept offers full crossbar functionality, security of data in transit through network, and capacity about 100 times that of typical fiber-optic local-area network in current use.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-18898 , Laser Tech. Brief.; 2; 4; P. 106
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Display system employing acousto-optic tunable filter (1993)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: An acousto-optic tunable filter (AOTF) is employed to generate a display by driving the AOTF with a RF electrical signal comprising modulated red, green, and blue video scan line signals and scanning the AOTF with a linearly polarized, pulsed light beam, resulting in encoding of color video columns (scan lines) of an input video image into vertical columns of the AOTF output beam. The AOTF is illuminated periodically as each acoustically-encoded scan line fills the cell aperture of the AOTF. A polarizing beam splitter removes the unused first order beam component of the AOTF output and, if desired, overlays a real world scene on the output plane. Resolutions as high as 30,000 lines are possible, providing holographic display capability.
    Keywords: OPTICS
    Type: NAS 1.71:NPO-18736-1-CU
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    System Would Generate Virtual Heads-Up Display (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Proposed helmet-mounted electronic display system superimposes full-color alphanumerical and/or graphical information onto observer's visual field. Displayed information projected directly onto observer's retinas, giving observer illusion of full-size computer display in foreground or background. Display stereoscopic, holographic, or in form of virtual image. Used by pilots to view navigational information while looking outside or at instruments, by security officers to view information about critical facilities while looking at visitors, or possibly even stock-exchange facilities to view desktop monitors and overhead displays simultaneously. System includes acousto-optical tunable filter (AOTF), which acts as both spectral filter and spatial light modulator.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-18736 , NASA Tech Briefs (ISSN 0145-319X); 18; 7; P. 22
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Unknown
    Acousto-optical Filter Can Rapidly Tune Solid-State Lasers (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Incorporation of acousto-optical tunable filter (AOTF) in cavity of solid-state laser, provides means of adjusting wavelength of laser output electronically, according to recent proposal. Output wavelength randomly selected in microseconds. Technique useful in remote-sensing applications, such as in differential-absorption lidar (DIAL) and in communications for wavelength-division multiplexing.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-17891 , NASA Tech Briefs (ISSN 0145-319X); 15; 6; P. 52
    Format: text
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    NASA TECHNICAL REPORTS
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