True Zero Order Broadband Mica Waveplates

Broadband mica waveplates are designed primarily for use in low power broadband or multi line applications when limited retardation accuracy is not an issue, but where low price is of highest importance. These waveplates are available in a wide range of standard diameters.

Visible broadband mica retarders are centered at 520 nm and effective in the range 400 – 700 nm.
Near Infrared mica retarders are centered at 850 nm and effective in the range 700 – 1100 nm.
Broadband mica retarders centered at other wavelengths, e.g. 550 nm, are available upon request.

Ring mount options and AR coatings for enhanced transmission are available upon request.

Each Mica sheet is sandwiched between protective glass flats for stability and easy handling.

S & R Optics’ unique cleaving process, with highest grade muscovite mica, allows best transmission, purity, homogeneity and highest surface quality specifications offered in the whole industry.

Compared to all other waveplates, our true zero order mica waveplates exhibit only negligible dependence of retardation on angle of incidence or field of view.

SPECIFICATIONS

Retarder Material	Muscovite Mica
Substrate Material	N-BK7
Transmitted Wavefront:	<1 Lambda at 633 nm for diameters ≤ 25.4 mm
Clear Aperture:	>85% of central diameter
Surface Quality	40-20 scratch dig
Diameter  D Tolerance:	+0/-0.25 mm
Retardation Tolerance: (520 nm or 850 nm types, over complete wavelength range)	λ/4 Plates: λ/16 λ/2 Plates: λ/8
Thickness t Tolerance:	+/- 0.25 mm
Damage Threshold (uncoated):	0.7 J/cm², 11 ns, 100 Hz @ 1064 nm
Temperature Coefficient of Retardation per °C	negligible

Outline Drawing
Permanent indicator dots on the edge mark the direction of the slow axis.

Ordering Information
Standard Size: 20.0 mm diameter

Part Number	Wavelength Range	Center Wavelength	Retardation (at Center Wavelength)	Diameter	Thickness t
	nm	nm		mm	mm
MA0100452	400-700	520	λ/4	10.0	2.5
MA0200452	400-700	520	λ/4	20.0	2.5
MA0250452	400-700	520	λ/4	25.0	2.5
MA0254452	400-700	520	λ/4	25.4	2.5
MA0500452	400-700	520	λ/4	50.0	3.5
MA0100252	400-700	520	λ/2	10.0	2.5
MA0200252	400-700	520	λ/2	20.0	2.5
MA0250252	400-700	520	λ/2	25.0	2.5
MA0254252	400-700	520	λ/2	25.4	2.5
MA0500252	400-700	520	λ/2	50.0	3.5
MA0100485	700-1100	850	λ/4	10.0	2.5
MA0200485	700-1100	850	λ/4	20.0	2.5
MA0100285	700-1100	850	λ/2	10.0	2.5
MA0200285	700-1100	850	λ/2	20.0	2.5

Part Number: MAxxxxyzz
xxxx Diameter in multiples of 0.1 mm
y Retardation: 4= λ/4, 2= λ/2
zz Center wavelength in multiples of 10 nm

Please inquire for other wavelengths, diameters and special retardation tolerance.

Ring Mounts, Black Anodized

Metric: Ø 25.0mm +/-0.1, CA = 18.0 mm
Imperial: Ø 25.4mm +/-0.1, CA = 18.0 mm