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Interesting. Beam combination would be tricky to achieve, especially if you want to retain coherence (though for spacecraft vapourisation that wouldn't matter).
Have you considered targetting the beams at the circumference of a circle inscribed around the centre of a parabolic mirror with tunable curvature?*
--
simon
* Warning. Do not target beams at a parabolic mirror, with or without tunable curvature.
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