- Unmatched off-axis performance
- Standard and custom wavelength retarders
- Mounted and unmounted versions available
- Off-axis performance ideal for uncollimated light applications
Meadowlark Optics now offers Wide Field Retarders, the latest innovation in near zero-order polymer retarder technology. At their design wavelength, Wide Field Retarders provide a consistent retardance value over a wide acceptance angle, out to 30° or more.
Standard quarter- and half-wave designs are available for common wavelengths in the visible to near infrared region. The graphs show the Wide Field Retarder performance as a function of incidence angle for the both half-wave and quarter-wave designs.
Multilayer broadband antireflection (BBAR) coatings are included as standard. Note that BBAR coating performance varies with incidence angle; these coatings perform best at (or near) normal incidence.
As with all Meadowlark Optics retarders, the fast axis is conveniently marked. Custom retardance values are available for wavelengths from 400-1800 nm. Please call for application assistance or to request a custom quotation.
|Specifications – Wide Field Retarder|
|Retarder Material||Birefringent Polymer|
|Standard Wavelengths||532, 632.8, 670, 780, 850, 1064, and 1550 nm|
|Custom Wavelengths||400-1800nm (specify)|
|Retardance||λ/2 and λ/4|
|Retardance Accuracy||≤ λ/250 at normal incidence at the center of the part|
|Retardance Change (at 30˚tilt)|
|Transmitted Wavefront Distortion||≤ λ/2|
|Surface Quality (scratch-dig)||60-40|
|Beam Deviation||≤ 1 arc-min|
|Reflectance (per surface)|
|At normal incidence
At 30˚ incidence
|Operating Temperature||0˚C to 40˚C|