New ZnS Optics for Mid-IR Lasers Offer Superior Damage Threshold
High performance, durable optics for the 2 µm to 5 µm spectral range
March 16, 2012
REO, a leading manufacturer of high volume precision optical solutions, has introduced a new range of mid-infrared optics that
provide higher laser damage threshold, better spectral performance, improved environmental stability and greater mechanical durability
over anything previously available. These zinc sulfide (ZnS or CLEARTRAN™) components are intended for use with Ho:YAG pumped optical
parametric oscillators (OPO’s) and other laser systems operating in the 2 µm to 5 µm spectral range. The ZnS substrates are precision
ground and polished and then coated using ion beam sputtering (IBS) technology. The IBS process yields fully densified thin films
which are virtually impervious to water absorption and, thus, extremely stable. These characteristics make them particularly well
suited for demanding applications such as IR countermeasures, laser designating/rangefinding, atmospheric sensing, and small molecule
This series of ZnS optics includes both flat and radiused components with substrates ranging from 5 mm to 150 mm in diameter.
They all feature high surface accuracy (λ/10 at 632.8 nm) and excellent surface quality (20-10), and are offered with a wide range
of antireflection, high reflection and multi-spectral coating options. The laser damage threshold of the antireflection bands of
these coatings has been measured to be >8 J/cm2 (at 2.05 µm in a 75 nsec pulse), while high reflection bands have demonstrated a
damage resistance of >50 J/cm2 (for the same pulse specifications).
REO produces high precision thin film coatings, optics and opto-mechanical assemblies for the ultraviolet, visible and infrared.
Located in Boulder, CO, the company primarily services medium to high volume OEMs including manufacturers of defense and aerospace
systems, laser systems, semiconductor tools, medical systems, life sciences instrumentation and telecom equipment.