Rugged pentaprisms for military laser rangefinding and target designation introduced by REO

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BOULDER, Colo., 9 Aug. 2011. Research Electro-Optics Inc. (REO) in Boulder, Colo., is introducing pentaprisms with coatings optimized for demanding military laser applications, such as laser target designation and laser rangefinding in tough environmental conditions such as exposure to salt spray.

The REO pentaprisms have dielectric anti reflection and reflective coatings manufactured using ion beam sputtering (IBS) technology to deliver densified films with strong laser damage characteristics of better than 12 J/cm² in 20-nanosecond pulses at 1064-nanometer wavelengths, as well as stability and mechanical durability, REO officials say.

REO experts can fabricate pentaprisms from a wide variety of materials for visible and near infrared spectral ranges. Pentaprism materials include fused silica, optical glasses, silicon, germanium, zinc selenide, and zinc sulfide. Entrance face sizes range from 12 to 25 millimeters. These optics also feature low total wavefront distortion on transmission, laser grade surface quality, and high deviation accuracy.

For more information contact REO online at

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