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This Defense Intelligence Reference Document from the Defense Intelligence Agency, dated 1 November 2010, was produced under the Advanced Aerospace Weapon System Applications (AAWSA) Program. It describes nanosatellite technologies and proposes launching nanosats into orbit with laser Lightcraft propulsion. It also covers a weapon mission selection study and multi-megawatt laser options. The author recommends that the Department of Defense and NASA bring Lightcraft R&D back to the United States and restart the X-50LR flight demonstration program.
“Sea”14 pages
UNCLASSIFIED/ /r;OA. oi;i;1@IAI! l!l!II! 9HL I Typical HPFLs that use fiber optical oscillators or amplifiers as an alternative to bulk rods and slabs have the following technical features [31]: • Active Gain Medium: - Common host glasses and their combinations: Silicates; silicates and phosphates; silicates, phosphates, and fluorides; silicates, germanates, and fluorides; silicates and fluorides. - Impurity lasing ions deposited (or Ytterbium (Yb 3+), Erbium (Er3+), Praseodymium (Pr 3+). doped) in host: Neodymium Thulium (Tm 3+), Holmium - Range of beam wavelengths(),) produced: 0.48 μm to 2.9 μm. - Stretched doped rod into a long thin fiber. - Simplifies heat removal (large surface area per unit volume). • Pump (see Figure 24): - Surround lasing fiber with optically transparent jacket. - End pump optical jacket with diode lasers. - Single diodes or diode bars are coupled into undoped pump fibers (Nd 3+), (Ho 3+), ■ Pump fibers are spliced or drawn together with the doped lasing fiber. ■ Pump light is coupled to the outer, undoped outer fiber. - Active medium pumped along entire length ■ Pump light then couples into the lasing fiber all along its length. - Resonator optics are coupled to the ends of the doped fiber. • Large Diameter Fibers (see Figure 25): - Handle more power. - Larger divergence with less beam quality. - Longer output fibers before limits are hit. • Small Diameter Fibers (see Figure 25): - Better divergence with greater beam quality. - Handle less power before limits: ■ Material limits - melt. ■ Stimulated Brillion Scattering (SBS). ■ Stimulated Raman Scattering (SRS). - Shorter output fibers. 55 UNCLASSIFIED/ ;CF81il 8FFI&I.t.k Wlili a,.kY
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 77 pages are in the text index: search them above, or from the library's search.