BROADBAND 1/2-WAVE RETARDERS FOR POLARIZATION ROTATION
A ½-wave retarder will rotate the plane of polarization by an amount that is twice the angle between the retarder axis (the white scribed line on the Cell) and the polarization plane. This Retarder is a combination of birefringent crystal plates, resulting in broadband phase retardation accurate within 1% across the designated spectrum. With broadband AR coatings, these Retarders transmit >98%. Mounted in standard Cell.

Specifications Aperture: Clear aperture 15mm mounted in 1" OD cell Substrate Material Crystal quartz & MgF2 Transmitted Wavefront λ/10 at 633nm Surface Quality 10-5 laser quality Diameter Tolerance + 0.00mm, - 0.25mm Parallelism 0.5 seconds Retardation Tolerance 0.5 % of design value at 20ºC

FRESNEL RHOMBS
The most achromatic of all Retarders are the Fresnel Rhombs. We manufacture both ¼-wave and ½-wave models for the ultraviolet and the visible-near IR. Surface quality 10/5 or better, flatness better than 1/10 wave, parallel better than 10 seconds. MOUNTING CELLS are provided with the Fresnel Rhombs. Both cells have ¼ -20 holes for standard bench post mounting.