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Superpolished Mirrors

Photonics Spectra
Sep 2011
Research Electro-Optics Inc. (REO)Request Info
 
REO’s new superpolished laser mirrors offer low loss and can be produced on a number of substrate materials. Their microroughness is <0.5 Å, enabling scattering loss of <5 ppm and finesse of 200,000 when incorporated into optical cavities. Ion beam-sputtered coatings, used to take advantage of the ultrasmooth surfaces, deliver reflectivities of >99.998% at any wavelength in the 450-nm to 2-μm range. The mirrors 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. Typical applications include cavity mirrors in low-gain gas and solid-state HeNe and HeCd lasers, and systems that use nonlinear processes.


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GLOSSARY
concave
Describing a hollow curved surface; curved inward.
convex
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.
Zerodur
Schott Glass Technologies' trade name for a glass-ceramic material with a very low coefficient of thermal expansion.
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