Dual Wavelength Waveplates

Dual Wavelength Waveplates
Dual Wavelength Waveplates Dual Wavelength Waveplates Dual Wavelength Waveplates

Material: High grade quartz crystals.
Single plate design to give different retardations for two specified wavelengths:
  a) Multi-order thick plates for narrow bandwidth lasers,
  b) True 0th-order
Ultrathin design (< 100 μm)  with a large bandwidth
     and minimum material dispersion for ultrafast pulses
All optical surfaces AR coated.
Optically robust with a high damage threshold.
Two plate sizes available:
       diameter 15 mm, mounted in OD 1" holder  and
       diameter 1" (25.4 mm), mounted in OD 30 mm holder

Mount adaptors available (OD 30 mm--OD 2")

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Dual Wavelength Waveplate Specifications:

Dimensions Tolerance: +/- 0.1 mm
Wavefront Distortion: < λ/8 @632.8 nm
Retardation Tolerance: < λ/60 for both wavelengths (for multi-order),
< λ/30  for both wavelengths (for ultrathin plate)
Surface Quality: 20-10 scratch and dig
Coating: AR coating with R < 0.5% at both wavelengths
Holder: OD 1" or 30 mm anodized aluminum holder
Clear Aperture: > Diameter - 2.0 mm (mounted)


Retardance curves for ultrathin (~ 45 um) DWP @ 800/400 nm:
























The ultrathin dual waveplate is a precise 0th-order half waveplate @ 800 nm and an approximate full waveplate @ 400nm. With the fast axis set @ 45 deg, a linearly polarizated light @ 800 nm is rotated by 90 deg and remains linear while a linearly polarized light @ 400 nm becomes slightly elliptical with the amplitude along the original polarization reduced by ~ 5%. This small "loss of amplitude" is not problematic for most applications.   

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