Dielectric High Reflective Coatings (DHR)

It is well-known that dielectric coating can be used to achieve high reflection (more than 99.8% reflected at a designed wavelength) and generally used in single wavelength laser cavity where the lowest cavity loss at a center wavelength is essential. We can provide such coating with center wavelength, from 250nm to 2200nm, according to customer’s special inquiry. When selecting a suitable dielectric high reflective coating, one must pay attention to the damage threshold .

l R0>99.5%@1064nm (RS>99.9%, RP<99.2%) — l R0>99.5%@1064nm
(RS>99.9%,
RP<99.2%)

We provide metallic high-reflective coatings with the materials Au, Ag, Al, Cr, and Ni-Cr. These coatings are applied to where the consistent high reflection in a wide spectral range is necessary. Their reflectivity are not higher than dielectrics HR coatings, but their HR spectrum can over near-UV, visible and near-IR. In order to prevent these metallic coatings from oxidizing, these coatings have been deposited on a layer of dielectrics coating.

l Ravg>95%@450~12000nm (Protected -Silver) lRavg>98%@2000~12000nm (Protected -Gold) — l Ravg>95%@450~12000nm
(Protected -Silver)
lRavg>98%@2000~12000nm
(Protected -Gold)

l Ravg>87%@400~1200nm (Protected -Al) l Ravg>Ravg>93%@400~1200nm (Enhanced -Al) — l Ravg>87%@400~1200nm
(Protected -Al)
l Ravg>Ravg>93%@400~1200nm
(Enhanced -Al)

Note: R _avg is average reflectivity from wavelength 400 to 1200nm.