Achromatic Waveplate

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Description

Achromatic waveplate is similar to zero order waveplate except that the two plates are made from different birefringent crystals. Since the dispersion of the birefringence of two materials is different, it is possible to specify the retardation values at a broad wavelength range. So, the retardation will be less sensitive to wavelength change. In other words, it can be used at a broadband wavelength range.

Feature

  • Epoxy Cemented or Air Spaced available

  • Very Broad Bandwidth

  • Custom size available

  • RoHS Compliant

Specifications

Material Crystal Quartz+MgF2
Dimension Tolerance +0.0/-0.2mm
Surface Quality 40/20 scratch and dig
Clear Aperture >90% central area
Wavefront Distortion /4@632.8nm  (for air spaced type)
Parallelism <10 arc seconds (for single plate)
Retardation Tolerance /100
Standard Wave quarter-wave(λ/4), half-wave(λ/2)
Standard Wavelength

450-650nm
550-750nm
650-1100nm
900-2100nm

Coating Both sides AR coated, R<1% per face
Damage Threshold Cemented: >500mJ/cm2, 20ns, 20Hz @1064nm
Air spaced: >5J/cm2, 20ns, 20Hz @1064nm