AAWSAP DIRD, Laser Lightcraft Nanosatellites, November 2010

This Defense Intelligence Reference Document (DIA-08-1011-001), dated 1 November 2010, was prepared by the Defense Intelligence Agency's Defense Warning Office under the Advanced Aerospace Weapon System Applications program. It covers nanosatellite technologies, laser Lightcraft propulsion, a weapon mission selection study and a multi-megawatt laser study. The author recommends that the Department of Defense, working with NASA, bring laser Lightcraft propulsion research back to the United States and restart the Air Force X-50LR test flight program.

From the source:Release of 2026-09-18 Incident: 11/1/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD examines laser-propelled “Lightcraft” as a possible low-cost method to launch very small satellites into low Earth orbit by using a remote high-energy laser to supply most of the propulsion energy rather than relying entirely on onboard energy sources. The report combines a survey of nanosatellite trends with a review of “Lightcraft” propulsion concepts, vehicle design, beam-control requirements, and mission studies, and argues that the most promising application is the launch of nano- or pico-satellites, especially Earth- and space-observing payloads of a few kilograms or less. It presents the concept as potentially much cheaper than conventional multistage rockets for very small payloads, while also noting significant practical constraints including strict beam-riding geometry, atmospheric losses, demanding pointing and adaptive-optics requirements, and heavy dependence on large ground-, sea-, or air-based laser infrastructure. Overall, the document presents laser “Lightcraft” as a technically plausible launch concept whose attractiveness depends on whether the supporting laser and beam-control system can be made reliable and economical at operational scale.

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Figure 20. DARPA's High Energy Liquid Laser Area Defense System (courtesy of P.
Saunders, AFRL/RDS, Kirtland AFB, NM).
Unlike chemical and gas dynamic laser devices, bulk solid-state lasers possess the
following unique characteristics, which make them highly competitive with any chemical
or gas dynamic laser systems [30]:
• Reliability.
• High level of safety.
• User-friend ly.
• Maintenance-free.
• Low-cost performance, high-volume production.
• Compact size.
• Wide range of wavelength selection and wavelength tunability.
• Variety of power oscillator or master oscillator-power amplifier (MOPA) designs.
• Scalability of beam output power, variety of beam combining techniques: scalable
to 1 MW beam power with in 2 years .
Typical solid-state lasers have the following tech nical features [30):
• Gain medium:
Host crystal [e.g., Yttrium Aluminum Garnet (YAG)], glass or ceramic
(amorphous materials).
- Impurity lasing ions deposited (or doped) in host [e.g., Neodymium (Nd 3+) or
Ytterbium (Yb 3+)].
- Range of beam wavelengths ( 11. ) produced: 0. 7 μm to > 2 μm.
• Optically pumped with flash lamps or diode lasers.
• Capable of high peak power pulses.
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