| Substrate Material: | 
Crystal Quartz | 
| Outer Diameter: | 
20.0,+0.0/-0.1mm,unmounted | 
| 
 Waveplate Type: 
(Single-plate design)  | 
 Low-order (n<3), Half-wave @ 852nm
    | 
| Crystal Thickness: | 
0.240mm (per 2th-order design) | 
| Parallelism: | 
< 2 arc seconds | 
| Retardance Accuracy(typ):  | 
< Lambda/300 @ designed wavelength | 
| Wavefront Distortion: | 
< Lambda/10 at designed wavelength | 
| Surface Quality: | 
20/10 scratch and dig | 
| Damage Threshold: | 
2J/cm2 @ 10ns 1064nm | 
| AR Coating/Both Surfaces: | 
AR/AR @ 852 +/-10nm (R<0.25%) | 
| MOQ: | 
MOQ50pcs(minimum order quantity)  |