Superpolished Mirrors0 pages

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#REO

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precision optical solutions Covering the full spectrum of your photonics needs.

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Think REO

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Superpolished Mirrors for Laser Applications

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These superpolished mirrors offer substantially lower loss than previously

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available from any supplier, enabling them to service the most demanding

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laser-based applications. Specifically, microroughness on these mirrors is

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below 0.5 Á, allowing them to achieve a scattering loss of under 5 ppm and a

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finesse of 200,000 when incorporated into optical cavities. In contrast, most

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commercially available superpolished mirrors only reach 100 ppm of loss and

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a finesse in the 30,000 range. Ion beam sputtered coatings (IBS) are

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employed to take full advantage of these ultra-smooth surfaces and deliver

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reflectivities of over 99.998% at any wavelength in the 450 nm to 2 urn range.

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REO superpolished mirrors can be produced on a number of different

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substrate materials, including BK7, fused silica, Zerodur, ULE, sapphire and

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silicon. They are supplied with diameters in 0.25 inch to 4.0 inch (6 mm to

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101 mm) range, with a flatness of Â/20 (at 633 nm), 10-5 surface quality over

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an 80% clear aperture, with zero defects (0-0) achievable over controlled sub-apertures. Furthermore, it is possible to use

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standard, solvent based cleaning methods and still maintain these exceptional loss specifications. Mirrors with piano,

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concave and convex surface shapes are all available. REO utilizes a suite of advanced metrology instrumentation to

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maintain and verify these performance specifications, including phase shifting interference microscopy, cavity ringdown

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measurements and photothermal common path interferometers.

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These superpolished mirrors are useful in any laser or laser-based system which demands extremely high reflectivity or very

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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

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systems which employ nonlinear processes. Other important uses are in ring laser gyroscopes (RLG), instruments based on

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cavity ringdown spectroscopy and frequency reference standards.

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Typical Specfications

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Substrate Material

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Design wavelength range

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Reflectivity

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Surface flatness (@ 633 nm)

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Surface quality

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Loss

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Cavity Finesse

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Size range

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Temperature range

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Humidity range

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BK7, fused silica, Zerodur, ULE, sapphire, silicon

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450 nm to 2 urn

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>99.998%

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A/20

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10-5 or better over 80% clear aperture

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0-0 over controlled sub-apertures

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< 5 ppm

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> 200,000

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0.25" to 4"

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-196 °Cto400 °C

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Oto 100%

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5505 Airport Blvd. Boulder, CO 80301 USA I 303.938.1960 I thinkreo.com

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