Measurements of the angular scattering and extinction of IR (10.6-μm) laser radiation in laboratory water and ice clouds are reported and compared to theoretical predictions for spheres and visible (0.633-μm) light scattering data. Randomly oriented cloud particles with dimensions ranging from several times smaller to larger than the incident wavelength generated phase functions span the Rayleigh and Mie scattering domains and illustrate the effects caused by strong internal energy absorption. Dual-wavelength extinction measurements reveal information on the growth and dissipation of laboratory water clouds and the effects of cloud seeding. The remote sensing significance of the findings is discussed.

© 1981 Optical Society of America

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