Documents / Official release
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 1. Air Force X-25LR Laser Lightcraft {courtesy of F. Mead, AFRL/ PRSP, Edwards AFB,
CA).
In the two-mode propulsion concept, a forebody aeroshell acts as an external
compression surface for the airbreathing engine inlet. Affixed to the bottom of the craft
is a parabolic-shaped afterbody mirror, which serves as a primary receptive optic for
the laser beam and as an external plug nozzle expansion surface. The primary thrust
structure is the centrally located annular shroud, which provides air through the inlet
and also acts as a ring-shaped energy "absorption/propulsion" chamber for plasma
formation. The air inlet is closed when the Lightcraft operates in the rocket mode.
The Lightcraft is very lightweight and uses its shape to facilitate vertical flight. The
craft has the appearance of a fat acorn when viewed from the side. The lower portion
of the craft is a very highly polished metal mirror, whereby the lower point of the
acorn-shape is the midpoint of a stretched-out parabolic mirror (see Figure 2). The
Lightcraft receives kilojoule pulses from a ground-based infrared laser at a rate of 25
times per second. The axisymmetric, off-axis parabolic collection mirror facilitates flight
by concentrating the pulsed laser light into an annular focus. The laser beam's pulse
interacts with the mirror, spreading out and focusing into an annular area inside the
circumference of the craft. The intensity of the 18 microsecond pulsed laser is
sufficiently high that atmospheric breakdown occurs in the annular area causing inlet air
to momentarily burst into a highly luminous plasma (10,000 - 30,000 K), thereby
producing a superheated plasma shock wave (with instantaneous pressures reaching
tens of atmospheres) that generates thrust in the direction of the laser beam. A lip
around the craft's circumference, akin to a plug nozzle, directs the expansion of the
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Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 77 pages are in the text index: search them above, or from the library's search.