Abstract
This chapter discusses the spectral measurements of the optical properties of water and compilations of water's refractive index and absorption coefficient. Rubens presented refractometer measurements of the refractive index n (λ) of water to a long-wavelength limit of 1.256 μm. These measurements of n (λ) were extended to a new long-wavelength limit of 2.327 μm, by Seegert's doctoral work. Rubens and Ladenberg also published their measurements of the reflectance and absorption spectra. Dorsey's presented a technical perspective thorough compilation of water's optical properties. He presented data about 320 references that spanned the spectral range from the low frequency to the X-ray region. Pontier and Dechambenoy measured reflectance spectra of water for angles of incidence of 0 degrees, 50, and 60 degrees in the 1-38 μm and 1-28 μm regions, respectively. The reflectance and absorption spectra and the appropriate Fresnel equations are used to determine n and k throughout the 1-40 μm wavelength regions.
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