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A highly reflective coating would likely reflect much of the light. If you could reduce the power by say 90%. or perhaps even 50%, that might be enough to render the laser ineffective. With reflected light, the photon energy is not absorbed, so one would not expect a mirror to heat up as much in direct sunlight as a black box would.A cone or cylinder shape (common on rockets) would tend to diffuse the light, but it would also cause a significant flash visible to observers.Is there any way to incorporate a mirror designed to reflect the light back to the source? Perhaps some kind of adjustable Fresnel type mirror?I think there are supposed to be issues with lasers ionizing the air, and thus their utility on earth is more limited than it would be if deployed in space (for space to space operations).
input more power than what is reflected,
would a very simple way to protect and object from a laser beam, no matter how powerful, be to cover it in a reflective surface?
X-ray lasers have been built and tested, though they were not terribly effective, and had an unfortunate tendency to be single use devices. Not easy to make a multi shot unit when you need a small ( 20 kiloton or so) nuke to generate the plasma channel and get it hot enough to get population inversion.
Mirrors that reflected were easy, just simple metal plate at each end, it shot a laser beam out of each end, lasting as long as it took to vapourise the unit.
The worlds most powerful laser, upto 1.8 mega-joules, uses mirrors, and lots of them, to reflect and concentrate 192 high energy beams into one. If it was the case that a mirror does not reflect light effectively and is damaged in the process then why on Earth would it be used in this device. According to some of the above responses a mirror would be ineffective against such high powered lasers,
PS. My car is the one with the mirror on the roof, you aint zapping me! 
For cars they have Masers, and your mirror on the roof does nothing to them 
Quote from: lightarrow on 29/07/2011 15:14:07For cars they have Masers, and your mirror on the roof does nothing to them You know that glass you get on the door of your microwave oven? Would that work with the MASER?