Achromatic - Cemented - 25.4mm

Achromatic – Cemented – 25.4mm


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Achromatic Waveplates – Cemented

Tower Optical offers this second series of Achromatic Waveplates (AWP’s) which are built using 25.4 mm substrates of crystal quartz and magnesium fluoride. These substrates are cemented together. This technique helps to control costs by reducing the number of surfaces requiring AR coating while increasing the physical size thus accommodating larger beam diameters. As with the original series of AWP’s these AWP’s are available in different wavelength ranges.

Each is broadband AR coated for its respective range. The retardation performance is shown graphically on the page “Achromatic Waveplates – Retardation Curves”.

Waveplate Specifications

Substrate material: crystal quartz & MgF2
Retardance: λ/4 and λ/2
Retardation tolerance: λ/100 overwavelength range
Clear aperture: 23 mm
Temp coefficient of retardation: less than λ/500 per °C
Wavelength ranges: 1 = 465-610 nm, 4 = 610- 850 nm, 2 = 700-1000 nm, 3 = 1200-1650 nm
Transmitted wavefront distortion: λ/4@633 nm
Surface quality: 20-10 Scratch-Dig
Beam deviation: less than 1 arc minute
Parallelism: less than 1 arc minute
AOI range for less than 1% change in retardance:
Optical axis: Marked on the mounting ring
Temperature storage range: -40°C to +75°C
Damage Threshold:
2 J/cm2 (8 ns pulse @ 1064 nm); 500 kW/cm2, CW
Diameter mounted:25.4 mm
Ring thickness: 30 mm
Coating: Ravg less than 1% at 465-610 nm per surface, Ravg less than 0.7% at 610-850 nm per surface, Ravg less than 0.6% at 700-1000 nm per surface, Ravg less than 0.5% at 1200-1650 nm per surface

  • Low retardation variations
  • Four broad spectral ranges
  • Cemented construction
  • Clear aperture of 23 mm
  • Unmounted diameter of 25.4 mm
  • Mounted in a 30 mm ring
  • Retardations of λ/2 and λ/4 wave

Wavelength Options

1) VIS 465 to 610 nm
2) VIS/NIR 610 to 850 nm
3) NIR 700 to 1000 nm
4) IR 1200 to 1650 nm

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We make custom versions of everything on this site. Send us your drawings or specifications and we will provide a quotation.