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Yes, green laser can be used for binoculars colimation instead of sun, but you also need to have some sort of bench / jig which will allow the laser (or binos) to be moved sideways (preserving the parallelism), so the light beam can enter both objectives at exactly the same angle (roughly perpendicular) and through their centers.
When the projected images formed by each binos side hit the same point on the target (close to the centre) then the colimation is OK.
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