Waveplate
Tower Optical

An Achromatic Waveplate, AWP, is made one piece of Crystal Quartz and one piece of Magnesium Fluoride, MgF2. These materials are birefringent and by matching of the birefringent changes in one material with those of the second, retardation changes are minimized as the wavelength changes. This produces a waveplate whose change in retardation is small for large variations in wavelength.

The AWP’s are available for three wavelength ranges: VIS (465-610nm), NIR (700-1000nm) and IR (1200-1650nm).

Specifications
Substrate Material: Crystal Quartz & MgF2
Retardance: l/4 and l/2
Retardation Tolerance: l/100 over wavelength range
Clear Aperture: 11.5mm
Temp Coefficient of Retardation: Wavelength ranges(nm): 465-610, 700-1000, 1200-1650
Transmitted Wavefront distortion: l/4@633nm
Surface Quality: 20/10 scratch dig
Parallelism: <1 arc min
AOI range for < 1% change in Retardance: +/-3°
Optical Axis: Marked on the mounting ring
Diameter Mounted: 25.4 mm
Thickness: 9mm
Coating: Ravg<1% at 465-610nm per surface
Ravg<0.6% at 700-1000nm per surface
Ravg<0.5% at 1200-1650nm per surface
Style: Airspaced
AO12A-¼-X, or, AO12A-½-X $695.00

X = 1 for 465-610nm,
X = 2 for 700-1000nm,
X = 3 for 1200-1650nm