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  • 1
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    Initial studies of the directional reflectance changes in pressed and sintered PTFE diffusers following exposure to contamination and ionizing radiation (2014)
    Institute of Physics
    Details
    Publication Date: 2014-11-20
    Print ISSN: 0026-1394
    Electronic ISSN: 1681-7575
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
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    Performance Modeling of an Airborne Raman Water Vapor Lidar (2000)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: A sophisticated Raman lidar numerical model had been developed. The model has been used to simulate the performance of two ground-based Raman water vapor lidar systems. After tuning the model using these ground-based measurements, the model is used to simulate the water vapor measurement capability of an airborne Raman lidar under both day-and night-time conditions for a wide range of water vapor conditions. The results indicate that, under many circumstances, the daytime measurements possess comparable resolution to an existing airborne differential absorption water vapor lidar while the nighttime measurement have higher resolution. In addition, a Raman lidar is capable of measurements not possible using a differential absorption system.
    Keywords: Instrumentation and Photography
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Diode-pumped laser research (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Laboratory for Oceans is currently working on the development of compact laser diode array (LD) pumped Nd:YAG lasers for use in space-based altimetry and ranging. Laser diode-array pumping technology promises to increase the electrical to optical efficiency of solid state lasers by an order of magnitude with a lifetime increase of nearly three orders of magnitude relative to today's conventional flashlamp-pumped laser systems. The small size, efficiency, and ruggedness make LD-pumped solid state lasers ideal for space based applications. In an in-house RTOP effort, a novel multiple-pass LD-pumped Nd:YAG laser amplifier was designed and tested to increase the 100 microjoule output pulse energy of the Lightwave laser oscillator. Preliminary results have yielded a round trip amplifier gain of about 15 percent using 7 microjoule LD-pump energy. As a parallel activity, funding was recently obtained to investigate the possible use of custom made fiber optic arrays to obtain an efficient optical coupling mechanism between the emitting laser diode-arrays and the target solid state laser material. Fiber optic coupling arrays would allow for the easy manipulation of the spatial emitting pattern of the diode pump sources to match either an end or side pumping laser configuration.
    Keywords: LASERS AND MASERS
    Type: Laboratory for Oceans; p 249-252
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Space Qualification of the Optical Filter Assemblies for the ICESat-2/ATLAS Instrument (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Advanced Topographic Laser Altimeter System (ATLAS) will be the only instrument on the Ice, Cloud, and Land Elevation Satellite -2 (ICESat-2). ICESat-2 is the 2nd-generation of the orbiting laser altimeter ICESat, which will continue polar ice topography measurements with improved precision laser-ranging techniques. In contrast to the original ICESat design, ICESat-2 will use a micro-pulse, multi-beam approach that provides dense cross-track sampling to help scientists determine a surface's slope with each pass of the satellite. The ATLAS laser will emit visible, green laser pulses at a wavelength of 532 nm and a rate of 10 kHz and will be split into 6 beams. A set of six identical, thermally tuned optical filter assemblies (OFA) will be used to remove background solar radiation from the collected signal while transmitting the laser light to the detectors. A seventh assembly will be used to monitor the laser center wavelength during the mission. In this paper, we present the design and optical performance measurements of the ATLAS OFA in air and in vacuum prior to their integration on the ATLAS instrument.
    Keywords: Spacecraft Instrumentation and Astrionics; Optics
    Type: GSFC-E-DAA-TN20459 , SPIE Photonics West 2015; Feb 07, 2015 - Feb 12, 2015; San Francisco, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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