Achromatic waveplates consist of two plates – one made out of MgF2 and one out of crystalline quartz. The plates can be cemented or mounted with an air gap, depending on your needs.
By suitably selecting the thickness of the plates, the total phase shift can be kept nearly constant across a large wavelength range, due to the difference in birefringence. Standard wavelength ranges are 465 nm to 610 nm, 700 nm to 1000 nm, or 1200 nm to 1650 nm. Other ranges can be manufactured upon request.
Available as half-wave plate and quarter-wave plate.
For any questions, feel free to contact us personally.
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