optical rhomboid prism / Fresnel / BK7 / fused silica
optical rhomboid, Fresnel
BK7, fused silica
The ALTECHNA Achromatic Fresnel Rhomb Retarders are made of BK7 crown glass or UV grade fused silica. The Fresnel Rhomb Retarders are equipped with Beam deviation that has 10arcsec and is an anti-reflection coated. This device can be used in to ways. The first option is that it is applicable to any adjustable unit (e.g. a stage) by the M6 and M4 tapped holes.The second option is for Polarizer Holder as 5PH50, 5PH51 or other compatible unit using the M27x1 thread. In addition to the said features, this device has a single and double rhomb. The Single Fresnel Rhomb provides a phase shift of 90 because of the total internal reflections at two surfaces. On the other hand, the Double Fresnel Rhomb provides a phase shift of 180.