REO superpolished mirrors enable scattering loss under 5 ppm

Oct. 20, 2011
These superpolished laser mirrors offer microroughness below 0.5 Å to enable scattering loss under 5 ppm and a finesse of 200,000 when incorporated into optical cavities.

These superpolished laser mirrors offer microroughness below 0.5 Å to enable scattering loss under 5 ppm and a finesse of 200,000 when incorporated into optical cavities. Ion-beam-sputtering coatings (IBS) deliver 99.998% reflectivity in the 450 nm to 2 µm range. Diameters range from 6–101 mm, with a flatness of λ/20 at 633 nm, 10-5 surface quality over an 80% clear aperture, and zero defects (0-0) achievable over controlled sub-apertures. Applications include low-gain gas and solid-state lasers such as HeNes and HeCds, nonlinear processes, ring laser gyroscopes (RLGs), cavity ring-down spectroscopy, and frequency reference standards.
Boulder, CO

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REO Introduces World’s Highest Quality, Commercial, Superpolished Mirrors

New superpolished laser mirrors from REO, a leading manufacturer of high volume precision optical solutions, offer substantially lower loss than previously available from any supplier, enabling them to service the most demanding applications. Specifically, microroughness on these mirrors is below 0.5 Å, allowing them to achieve a scattering loss of under 5 ppm and a finesse of 200,000 when incorporated into optical cavities. In contrast, most commercially available superpolished mirrors only reach 100 ppm of loss and a finesse in the 30,000 range. Ion beam sputtered coatings (IBS) are employed to take full advantage of these ultra-smooth surfaces and deliver reflectivities of over 99.998% at any wavelength in the 450 nm to 2 µm range.

REO superpolished mirrors can be produced on a number of different substrate materials, including BK7, fused silica, Zerodur, ULE, sapphire and silicon. They are supplied with diameters in 0.25 inch to 4.0 inch (6 mm to 101 mm) range, with a flatness of λ/20 (at 633 nm), 10-5 surface quality over an 80% clear aperture, with zero defects (0-0) achievable over controlled sub-apertures. Furthermore, it is possible to use standard, solvent based cleaning methods and still maintain these exceptional loss specifications. Mirrors with plano, concave and convex surface shapes are all available. REO utilizes a suite of advanced metrology instrumentation to maintain and verify these performance specifications, including phase shifting interference microscopy, cavity ringdown measurements and photothermal common path interferometers.

These superpolished mirrors are useful in any laser or laser-based system which demands extremely high reflectivity or very low loss. Typical applications are as cavity mirrors in low gain gas and solid state lasers, such as HeNe’s and HeCd’s, and in systems which employ non-linear processes. Other important uses are in ring laser gyroscopes (RLG), instruments based on cavity ringdown spectroscopy and frequency reference standards.

About REO

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. REO is a privately held company. For more information, contact Mark Damery, Vice President and General Manager of Worldwide Sales, at +1-720-562-3213, e-mail [email protected],, or Susan Anway, Vice President of Finance and Chief Financial Officer at +1-720-562-3206, e-mail [email protected].


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