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ZnS Optics for Mid-IR Lasers

Research Electro-Optics Inc. (REO)Request Info
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REO Inc. has introduced a line of mid-infrared optics that provide a high laser damage threshold, good spectral performance, environmental stability and mechanical durability.

The zinc sulfide (ZnS or Cleartran) components are intended for use with Ho:YAG-pumped optical parametric oscillators and other laser systems operating in the 2- to 5-µm spectral range. The ZnS substrates are precision-ground and —polished, then coated using ion beam sputtering technology, which yields fully densified thin films that are virtually impervious to water absorption and, thus, are extremely stable. They are well suited for demanding applications such as IR countermeasures, laser designating/rangefinding, atmospheric sensing and small-molecule spectroscopy.

The series of ZnS optics includes both flat and radiused components with substrates ranging from 5 to 150 mm in diameter. They all feature surface accuracy of λ/10 at 632.8 nm and 20-10 surface quality, and are offered with a wide range of antireflection, high-reflection and multispectral coating options. The laser damage threshold of the antireflection bands has been measured at >8 J/cm2 at 2.05 µm in a 75-ns pulse, while high reflection bands have demonstrated a damage resistance of >50 J/cm2 for the same pulse specifications.

Photonics Spectra
May 2012

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