reply to post by ZIVONIC
They do use mirrors, its very true. But the type of material they use to make those mirrors out of would not be cost effective to apply to an entire
aircraft or tank, many times over.
There is a segment here , under the heading " Instruments " which explains that dielectric mirrors are used in lazer tech. It also says that the
best of them can reflect 99.999% of the light, which hits the mirror.
But the devil is in the details, because that is only possible within a narrow band of wavelengths, which have to be pre specified and built into the
design. However, any reasonable person building a lazer weapon will make the wavelength variable, perhaps by having various focusing mirrors ,
designed for different power ranges on a selector switch , so that control can be exerted over the focus of the beam, or if you like , the width of
For example, if firing on fleshly targets, the nesscesity for an extremely high intensity beam is almost non existant at the power ranges we are
talking about. A wider but powerful beam, could cook a group of combatant targets in thier patheticaly inadequate personal armour very easily, but to
punch a hole in a tank , and cook its ammo supply, a tight focus beam would be more effective. Now, with that in mind, a suitable dielectric mirror
for use as a protective deflector would be incredibly difficult to come by, because its effectiveness would be dramaticaly less, when faced with
wavelengths it was not designed specificaly to withstand.
Further more, even the angle of incidence would be an issue. Near enough all mirrors used in lazer tech, only operate within certain conditions,
which they are specificaly designed to deal with. The angle at which the lazer energy impacts the mirror is no exception. If the energy hits the
mirror from a bad angle, outside its recommended range, unfortunate consequences, like setting crap on fire by accident, may occur!
I looked up dielectric mirrors for moderate power argon and blue lazer applications. These would not even be heavy industrial grade lazers. They cost
159 dollars for a one inch diameter mirror 0.32 inches thick, effective in nanometer ranges from three hundred to five hundred, and only capable of
deflecting 99% of the energy delivered to them at angles from zero to forty five degrees. Any deviation from that could cause cracking, melting, or
even combustion dependant on just how bad the angles are. Now, I fail to see how similar mirrors as are used in lazer beam aiming , could be used as
sheilding effectively, baring in mind the limitations involved with thier application. Also , at one hundred and fifty nine dollars per inch, (and
probably costing more since they would have to be adaptable to the shapes of military wartech) how that will ever be cost effective enough to be
employed as a serious solution.