Abstract
A single beam spectrophotometer has been developed for the measurement of spectral attenuation coefficients of very low loss optical glasses in the wavelength range 400-1000 nm. The instrument has an accuracy to ±0·00005 cm−1 when sample thicknesses of 20 cm are used. The basic stability of the instrument and the sources and effects of systematic errors have been investigated in detail. Some results are presented in the form of attenuation curves for four different low-loss optical glasses.