They can operate from the ultraviolet through the infrared spectrum, with particularly strong performance in the visible, near-infrared (NIR), and mid-infrared (MIR) regions. Typical aluminum- and gold-coated mirrors, for instance, can effectively reflect light from approximately 200 nm to 2500 nm, with reflectivity generally reaching around 98–99% depending on the coating and wavelength.

Due to the intrinsic characteristics of metallic coatings, these mirrors also demonstrate good tolerance to temperature changes and environmental conditions. This results in stable optical performance, long-term durability, and reliable operation even in demanding research and industrial environments, making them a versatile choice for broadband optical applications.