Refractive properties of barium fluoride are discussed. The refractive index, n, was determined at 25°C for 46 measured wavelengths from 0.2652 μ in the ultraviolet to 10.346 in the infrared. The dispersion equation
where λ is expressed in microns was found to fit the measured values with an average absolute residual of 1.91×10−5
. A tentative average thermal coefficient of index dn/dt
for the measured spectral range is −12×10−6
/°C Dispersive quantities which indicate the expected relative dispersion, chromatic aberration, and the effect of index on resolution are graphically presented. A review of transmittance data from the literature is also presented.
© 1964 Optical Society of America
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