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WAVE PLATES

Photonics Spectra
Jul 2004
Thorlabs Inc.Request Info
 
Thorlabs Inc.'s achromatic wave plates are zero-order retarders that use two birefringent materials, crystalline quartz and magnesium fluoride, to balance dispersion and to provide a nominally flat spectral response. Each wave plate is computer-designed and optimized for minimum root mean square retardance error over a broad spectral range. They are air-spaced, have antireflection coatings on all surfaces for low insertion loss, and can handle high optical powers. Quarter and half versions are available. Surface quality is 40-20 scratch-dig, transmitted wavefront error is <λ/4, and beam deviation is <1 arc min.


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GLOSSARY
magnesium fluoride
A colorless, crystalline compound whose low refractive index (n = 1.38) makes it effective as a lens antireflection coating when deposited by thermal evaporation in a near vacuum. This process develops a coating that is robust and stable, though only a few molecules thick.
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