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Achromatic Waveplate (Broadband waveplate)
 
      Achromatic waveplate is similar to Zero-order waveplate except
that the two plates are made from different materials, such as crystal quartz and magnesium fluoride. Since the dispersion of the
birefringence can be different for the two materials, it is possible
to specify the retardation values at a broadband wavelength range. Hence, the retardation of the resulting waveplate can be made to low sensitivity to wavelength change.
 

Specifications:
Material: Crystal Quartz and Crystal MgF2
Dimension Tolerance: +0.0, -0.2 mm
Thickness: around 2mm
Wavefront Distortion: L/4 @ 632.8 nm
Retardation Tolerance: up to L/100 at specified wavelength
Wavelength Range:
      VIS: 450nm-620nm
      NIR: 700nm-1000nm
      IR: 1200nm-1650nm
Customer specified wavelength in 400~2100nm
Parallelism: up to 10 arc second
Surface Quality: 20-10 scratch and dig
BBAR coating Ravg<0.5%

Air-spaced achromatic waveplate is also available upon request.
Retardation curve samples:

Half waveplate @ 465-650nm

Half waveplate @700-1000nm

Half waveplate @ 1200-1650nm


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