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Superpolished Mirrors
Jun 2011
Research Electro-Optics Inc. (REO)Request Info
BOULDER, Colo., June 6, 2011 — New superpolished laser mirrors from REO offer low loss, making them suitable for use in demanding applications.

Microroughness is <0.5 Å, allowing them to achieve scattering loss of <5 ppm and finesse of 200,000 when incorporated into optical cavities. Ion beam-sputtered coatings are used to take advantage of the ultrasmooth surfaces and deliver reflectivities of >99.998% at any wavelength in the 450-nm to 2-µm range.

The mirrors can be produced on a number of substrate materials, including BK7, fused silica, Zerodur, ULE, sapphire and silicon. They are supplied with diameters in the 6- 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 subapertures.

Standard solvent-based cleaning methods maintain the low-loss specification. Mirrors with plano, concave and convex surface shapes are available. The company uses 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.

The superpolished mirrors are useful in any laser or laser-based system that requires high reflectivity or low loss. Typical applications include cavity mirrors in low-gain gas and solid-state HeNe and HeCd lasers, and systems that use nonlinear processes. Other uses are in ring laser gyroscopes, instruments based on cavity ringdown spectroscopy and frequency reference standards.


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Describing a hollow curved surface; curved inward.
Denoting a spherically shaped surface; curved outward.
fused silica
Glass consisting of almost pure silicon dioxide (SiO2). Also called vitreous silica. Frequently used in optical fibers and windows.
The science of measurement, particularly of lengths and angles.
Schott Glass Technologies' trade name for a glass-ceramic material with a very low coefficient of thermal expansion.
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