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  • 1990-1994  (2)
  • 1980-1984  (10)
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Keywords
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Years
Year
  • 1
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    POWER LASER BEAMING AND APPLICATIONS IN SPACE (1991)
    EDP Sciences
    Details
    Publication Date: 1991-12-01
    Print ISSN: 1155-4339
    Electronic ISSN: 1764-7177
    Topics: Physics
    Published by EDP Sciences
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    PAPER CURRENT
  • 2
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    Preliminary comparison of laser and solar space power systems (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Four laser receiver systems are compared to onboard solar photovoltaic power generation for spacecraft electrical requirements. The laser photovoltaic and laser MHD receivers were found to be lighter than a comparable planar solar photovoltaic system. The laser receiver also shows less drag at lower altitudes. Panel area is also reduced for the laser receiver allowing fewer Shuttle trips for construction. Finally, it is shown that a 1 megawatt laser and receiver system might be constructed with less weight than a comparable planar solar photovoltaic system.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Study of process technology for GaAlAs/GaAs heteroface solar cells (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Two processes were considered: the infinite melt process and the finite melt process. The only technique that is developed to the point that 10,000 cells could be produced in one year is the infinite melt liquid phase epitaxy process. The lowest cost per cell was achieved with the advanced metal organic chemical vapor deposition process. Molecular beam epitaxy was limited by the slow growth rate. The lowest cost, an 18 percent efficient cell at air mass zero, was approximately $70 per watt.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Photovoltaic Res. and Technol.; p 87-94
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    GaAs solar cells (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The major thrusts proposed for GaAs were increased efficiency and improved radiation damage data. Current laboratory production cells consistently achieve 16 percent AMO one-Sun efficiency. The user community wants 18-percent efficient cells as soon as possible, and such a goal is though to be achievable in 2 years with sufficient research funds. A 20-percent research cell is considered the efficiency limit with current technology, and such a cell seems realizable in approximately 4 years. Future efficiency improvements await improved substrates and materials. For still higher efficiencies, concentrator cells and multijunction cells are proposed as near-term directions.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1982: High Efficiency, Radiation Damage, and Blanket Technol.; p 265-266
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A NASA high-power space-based laser research and applications program (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Applications of high power lasers are discussed which might fulfill the needs of NASA missions, and the technology characteristics of laser research programs are outlined. The status of the NASA programs or lasers, laser receivers, and laser propulsion is discussed, and recommendations are presented for a proposed expanded NASA program in these areas. Program elements that are critical are discussed in detail.
    Keywords: LASERS AND MASERS
    Type: NASA-SP-464 , NAS 1.21:464 , LC-83-600161
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    A thermochemical model of radiation damage and annealing applied to GaAs solar cells (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Calculations of the equilibrium conditions for continuous radiation damage and thermal annealing are reported. The calculations are based on a thermochemical model developed to analyze the incorporation of point imperfections in GaAs, and modified by introducing the radiation to produce native lattice defects rather than high-temperature and arsenic atmospheric pressure. The concentration of a set of defects, including vacancies, divacancies, and impurity vacancy complexes, are calculated as a function of temperature. Minority carrier lifetimes, short circuit current, and efficiency are deduced for a range of equilibrium temperatures. The results indicate that GaAs solar cells could have a mission life which is not greatly limited by radiation damage.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; May 12, 1981 - May 15, 1981; Kissimmee, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Thermal stability of GaAs heteroface solar cells with differing contact materials (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: GaAlAs/GaAs heteroface solar cells used in space offer advantages of higher operating temperatures and recovery from radiation damage using thermal annealing. Elevated temperature experiments were conducted to evaluate the electrical stability of cells with different contact materials. These experiments indicate that for operation of GaAs heteroface solar cells at elevated temperatures, front contact metals must be carefully chosen. The short circuit current varied by only about 3% for cells with Pd/Ag contacts that were heated to 240 C for a total of 500 hours. However, a total decrease in the open circuit voltage of about 20% was observed for these cells. After heating cells to 400 C, large changes in open circuit voltage were observed for cells with Pd/Ag, Pd/Au, Pd, Ag, and Ti contacts; however, preliminary results indicate more stable open circuit voltages for cells with Au, Cr, Zn, and Cr/Au contacts.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: In: Intersociety Energy Conversion Engineering Conference; Aug 09, 1981 - Aug 14, 1981; Atlanta, GA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Diode laser power module for beamed power transmission (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Recent progress with powerful, efficient, and coherent monolithic diode master-oscillator/power-amplifier (M-MOPA) systems is promising for the development of a space-based diode laser power station. A conceptual design of a 50-kW diode laser power module was made for space-based power stations capable of beaming coherent power to the moon, Martian rovers, or other satellites. The laser diode power module consists of a solar photovoltaic array or nuclear power source, diode laser arrays (LDAs), a phase controller, beam-steering optics, a thermal management unit, and a radiator. Thermal load management and other relevant aspects of the system (such as power requirements and system mass) are considered. The 50-kW power module described includes the highest available efficiency of LD M-MOPA system to date. However, the overall efficiency of three amplifier stages, including the coupling efficiency, turns out to be 55.5 percent. Though a chain of PA stages generates a high-power coherent beam, there is a penalty due to the coupling loss between stages. The specific power of the 50-kW module using solar power is 6.58 W/kg.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''91: Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Space Laser Power Transmission System Studies (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Power transmission by laser technique is addressed. Space to Earth and space to space configurations are considered.
    Keywords: LASERS AND MASERS
    Type: NASA-CP-2214 , L-15030 , Oct 14, 1981 - Oct 15, 1981; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    GaAs solar cells for space applications (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: GaAs solar cells offer substantial advantages for space photovoltaic power over Si solar cells in the areas of efficiency, elevated temperature operation, and radiation damage stability. A mission cost comparison is made for GaAs and Si solar cells. For Si cell arrays, the total mission cost is found to be a minimum for a solar concentration of 2.9. For GaAs, modes of operation and construction are investigated. Modes having lower mission costs than the minimum Si mission cost are defined. These include higher concentrations, lightweight cells, and simultaneous power generation and annealing. The technological progress necessary for GaAs to operate in these modes is identified.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Energy to the 21st century; Aug 18, 1980 - Aug 22, 1980; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
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