<title>Scattering in lanthana-strengthened-yttria infrared transmitting material</title>

Lanthana-strengthened yttria (LSY) is a window and dome material for 3 - 5 micrometers IR applications. Scattering, an important optical property of LSY, was measured using a scatterometer method and integrating sphere technique. The scatterometer results were correlated with the integrating sphere results. The mechanisms of forward scattering in LSY are discussed.