METALLIC MIRRORS
Protected Metal Mirrors
Protected metal coatings consist of one layer of a highly reflective metal such as gold, copper, or silver with a dielectric overcoat to protect against oxidation and other potential damage. The protective layer also allows the mirror to be cleaned with solvents.
Enhanced Metal Mirrors
Enhanced metal coatings consist of a layer of a highly reflective metal such as gold, copper, or silver plus a minimum of one pair of low and high index dielectric materials. These coatings enhance the reflectivity of the chosen metal and can be optimized to target virtually any wavelength in both the visible and infrared.
Spectral scan of an Enhanced Metal coating done at LohnStar Optics optimized for use at 6.8µm
Phase Retarding Mirrors (CO2)
Phase Retarders, also known as 90° Phase Shift Mirrors, are used to convert a linearly polarized beam to a circularly polarized beam. Our coatings are optimized for high power applications. Typical substrate materials are Silicon and Copper.
Standard Specifications:
Reflectivity @ 10.6µm > 99%
Phase Retardation: 90° ±3°
Zero Phase Shift Mirrors (CO2)
Zero Phase Shift Mirrors are used to maintain the polarization state of the incident beam (typically a circularly polarized beam). Our coatings are optimized for high power applications. Typical substrate materials are Silicon and Copper.
Standard Specifications for EM2:
Reflectivity @ 10.6µm > 99.6%
Absorption @ 10.6µm ≤ .20%
Phase Shift: 0° ± 2°
