Abstract

A protected gold mirror was used as a reference mirror for the measurement of the reflectance between 600nm and 1700nm of samples in a double beam spectrophotometer. The results showed that the measurements were more accurate compared to those using an aluminum mirror or gold mirror as the reference. The FTIR reflectance curve indicated that the protected gold mirror shows almost zero absorption at the wavelength between 2.5um and 16um. This allows the protected Au mirror to be used as an ideal reference mirror with a range from 0.6um to 16um. Furthermore, abrasion testing (50 rubs by cheesecloth) caused no damage of the coatings on the protected Au mirror, which allows for regular cleaning.

© 1992 Optical Society of America