The influence of polishing time on the surface structure of optical elements is shown for germanium lenses. The surface structure is measured with a profilometer and expressed in the form of center-line average (CLA) values. Veiling glare of single lenses manufactured under different conditions is measured in the infrared spectral region (IR) between 3 and 10 Am. An instrument to measure the relative veiling glare ratio in the IR is shown. The results are discussed. The image quality of these lenses is shown as fine-line images and modulation transfer func tion (MTF) measurements. An imperfect surface structure affects more greatly the shorter spectral region. The results are interpreted. The roughness of single-point diamond-turned lenses is compared with that of optically polished lenses.
"Surface Structure, Veiling Glare, And Image Quality Of Optical Elements In The 3 To 10 Am Spectral Region," Optical Engineering 23(2), 232137 (1 April 1984). https://doi.org/10.1117/12.7973401