Talk:Beam-powered propulsion

message: The problem of diffraction and keeping the beam tight over large distances should be quantified.  I believe it is something like: BeamDiameter = Wavelength * Range / EmittingAperture.  For typical optical frequencies, I think you will find something like 75 kilometer beam diameter divided by meters of aperture, at a distance of 1 AU.  For distances on the order of 1 AU, interplanetary distances, this implies a laser with an aperture on the order of kilometers.  Someone check my math, please.  DonPMitchell 23:04, 15 November 2007 (UTC)
thread_title: 2007 & 2008

message: What about beams that come from space instead of the ground?  There could be solar panels in space as the power source in addition to (in instead of) the ground-based power.  I don't have time to find a good reference now but this should be included.  — Preceding unsigned comment added by Spot (talk • contribs) 14:21, 10 January 2012 (UTC)
thread_title:  Space-based beams 

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