Don’t touch the surface of optical lens with hands directly, including reflecting mirror, galvanometer, scanning lens etc., or will damage the surface of the lens. If the lens is contaminated with oil stain or dirt, it will affect the performance of lens.
It’s prohibited to clean the optical lens by water, detergent or other cleanse, because the surface of the lens is coated with a special film which will be damaged if use those materials to clean it. The contaminant will affect the quality of laser beam, what's worse, it will affect the generation of laser beam.
Don’t use damaged lens. If the lens get damaged, send it to the supplier immediately for repairing.
Don’t apply too much pressure during the replacing of reflecting/focusing mirror, or it causes distortion of the lens which will affect the quality of laser beam.
Don’t place the lens in a dark, moist environment.