True Zero Order Bare

Retarder Material

Muscovite Mica  

Beam Deviation

10 arcsec

Wavefront  

/10 @ 633 nm  

Clear Aperture

85% of central diameter

Surface Quality

40-20 scratch dig  

Retardation Tolerance

/50 for 532 nm type
(/40 - /300 depending on design wavelength)

Homogeneity of Retardation

/200

Diameter Tolerance

+0 / -0.1 mm

Damage Threshold, pulsed

10 J/cm, 11 ns, 100 Hz @ 1064 nm
(58 J/cm test result)

Damage Threshold, cw

0.5 kw/cm @ VIS-NIR

Temperature Coefficient of Retardation per C

negligible  

Standard Retardations

/4, /2