Abstract

Efficient random-scattering surfaces for the IR have been fabricated by cementing submillimeter-sized shavings or pellets to a metallic substrate with metal-filled epoxy, followed by deposition of a Ag overcoating. The measured height and lateral spacing distributions for these preparations are both nearly Gaussian. Net surface reflectivities of ≥90% have been measured at 10 μm, and the three-dimensional angular intensity distributions agree with the cosine law that defines a perfect uniform diffusing surface to within ~10%. Careful extrapolation of the 10-μm data into the far IR, combined with sample measurements at 90 and 250 μm, indicate that reflectivities of >96% can be achieved for λ ≥ 90 μm with comparable uniformity of diffusion. These surfaces are intended for use in overmoded resonator cavities excited by continuously tunable, pulsed, far-IR lasers, but they should also find use in other applications where high net reflectivity, uniform diffusion, and ready control of the dimensions of the individual scattering elements are important considerations.

© 1993 Optical Society of America

Diffuse reflectance of oceanic waters. II. Bidirectional aspects

André Morel and Bernard Gentili
Appl. Opt. 32(33) 6864-6879 (1993)

Far Infrared Reflectometer for Imperfectly Diffuse Specimens

R. T. Neher and D. K. Edwards
Appl. Opt. 4(7) 775-780 (1965)

Single-angle reflectance spectroscopy to determine the optical constants n and k: considerations in the far-infrared domain

Brent M. DeVetter, Nicole K. Scharko, Bret D. Cannon, Tanya L. Myers, and Timothy J. Johnson
Appl. Opt. 57(22) 6587-6597 (2018)

Polarization of the reflectivity of paints and other rough surfaces in the infrared

Uri P. Oppenheim and Yoram Feiner
Appl. Opt. 34(10) 1664-1671 (1995)

Technique for measuring the reflectance of irregular, submillimeter-sized samples

Christopher C. Homes, M. Reedyk, D. A. Cradles, and T. Timusk
Appl. Opt. 32(16) 2976-2983 (1993)