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25.4mm Dia, 465-610nm, λ/4 Achromatic Waveplate

Achromatic Waveplates (Retarders)

Achromatic Waveplates (Retarders)

Stock #46-558
Qty 1-5
Qty 6
Retardance Tolerance:
≤ λ/100
Wavelength Range (nm):
465 - 610
Clear Aperture CA (mm):
Diameter (mm):
Achromatic Waveplate
Surface Quality:
Transmitted Wavefront, P-V:
λ/4 @ 633nm
Coating Specification:
Ravg <1% @ 465 - 610nm
Damage Threshold, CW:
500 kW/cm2
Damage Threshold, Pulsed:
2 J/cm2, 8ns pulse @ 1064nm
Housing Tolerance (mm):
Parallelism (arcmin):
Crystal Quartz and MgF2
Thickness (mm):
Thickness Tolerance (mm):
Temperature Coefficient (λ/°C):
Air Spaced

Product Family Description

  • Multiple Wavelength Ranges Available
  • Flat Response Over Each Broad Spectral Range
  • λ/4 and λ/2 Retardance
  • Mounted in Black Anodized Aluminium Housing

Unlike standard waveplates, Achromatic Waveplates (Retarders) provide a constant phase shift independent of the wavelength of light that is used. This wavelength independence is achieved by using two different birefringent crystalline materials. The relative shifts in retardation over the wavelength range are balanced between the two materials used. The flat response of an Achromatic Waveplate (Retarder) is ideal for use with tunable lasers, multiple laser line systems, and other broad spectrum sources.

Designed to be used at an angle of incidence of 0°, changes of ±3° will yield less than 1% change in retardance. The 11.5mm clear aperture waveplates feature an air spaced construction; the 23mm clear aperture waveplates are cemented. All Achromatic Waveplates (Retarders) are mounted in an anodized aluminum housing with the fast axis clearly indicated.

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