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25.4mm Dia, 450 - 650nm, λ/4 Achromatic Waveplate

Achromatic Waveplates (Retarders)

Stock #39-032 In Stock
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Clear Aperture CA (mm):
Ravg <0.75% @ 450 - 650nm
Diameter (mm):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Crystal Quartz and MgF2
Surface Quality:
Thickness (mm):
6.00 ±0.2
Achromatic Waveplate
Dimensional Tolerance (mm):
Transmitted Wavefront, P-V:
<λ/4 @ 632nm
Parallelism (arcsec):
Housing Tolerance (mm):
Retardance Tolerance:
λ/100 @ 20°C
Coating Specification:
Ravg <0.75% @ 450 - 650nm
Wavelength Range (nm):
450 - 650
Damage Threshold, By Design: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification.
>5 J/cm2 @ 1064nm, 10ns, 10Hz
Air Spaced

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
Reach 235:

Product Family Description

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

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. Achromatic Waveplates (Retarders), with their flat response, are 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 23mm clear aperture waveplates will feature a cemented construction. All Achromatic Waveplates (Retarders) are mounted in an anodized aluminum housing with the fast axis clearly indicated.