The mirror surface can only be a high reflection band, do 100% reflection and transmission, a part of the most powerful laser pointer to destroy the mirror surface, and in the light of the mirror case, it is difficult to have the time response, laser beam to detect and adjust the angle of the mirror reflection attacks.
This difficulty, because the most powerful laser pointer are usually not visible, you can not know the laser weapons from which direction, so it will be very difficult for you to effectively intercept weapons. At the same time laser energy density is very high, the general lens had estimated scrap.
The essence of most powerful laser pointer is an electromagnetic wave, or a photon, the photon energy is calculated by E=hv, where h is the Planck constant V frequency. Therefore, the higher the frequency, the higher the energy. The laser frequency range of 3.846 * 10^14Hz to 7.895 * 10^14Hz.
In view of this, most powerful laser pointer energy is not great, but its large energy density (because its scope is very small, only one point), a short time to gather a large amount of energy. The laser weapon is the use of the photon energy destruction, it is conceivable that the mirror may be a reflection however, after the moment it was melting, so to the very little utility.