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High performance pentaprisms

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REO now offers high performance pentaprisms with coatings optimised for demanding laser applications, such as target designation and rangefinding. The pentaprisms feature all dielectric antireflection and high reflection coatings manufactured using ion beam sputtering (IBS) technology.

IBS delivers fully densified films that exhibit superior laser damage characteristics (over 12J/cm² in 20ns pulses at 1064nm for the antireflection coatings), as well as exceptional environmental stability and mechanical durability. This makes them particularly well suited for applications in harsh environments, including exposure to salt spray. IBS technology also enables highly consistent production of optical coatings with complex spectral characteristics, including multi-spectral operation, where high performance is required at several widely spaced wavelengths or wavelength bands (for example, both 1064 and 1573nm).

REO pentraprisms can be fabricated from a wide variety of materials suitable for the visible and near infrared spectral ranges, including fused silica, optical glasses, Si, Ge, ZnSe and ZnS. Typical entrance face size range is from 12 to 25mm. These optics also feature low total wavefront distortion on transmission (<λ/4 at 633nm), laser grade surface quality (10-5), and high deviation accuracy (≤30 arc seconds).