Sapphire windows from Laser Research Optics are available at sizes from 1/2 to 2 in.

Dec. 2, 2016
Sapphire fiber laser windows for 1064 nm cutting lasers have Moh 9 hardness with antireflective coatings on both sides.
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Sapphire fiber laser windows for 1064 nm cutting lasers have Moh 9 hardness with antireflective coatings on both sides, for transmission of >99.5% at 1.06 μm and >90% between 650 and 670 nm. They have a 10-5 scratch-dig finish, provide 1/4-wave transmitted wavefront, and are available at sizes from 1/2 to 2 in.
Laser Research Optics
Providence, RI

www.laserresearchoptics.net

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