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50.8mm Dia, 900 - 2100nm, λ/2 Achromatic Waveplate

Achromatic Waveplates (Retarders)

Stock #39-053
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Retardance Tolerance:
λ/100 @ 20°C
Wavelength Range (nm):
900 - 2100
Clear Aperture CA (mm):
Diameter (mm):
Achromatic Waveplate
Surface Quality:
Transmitted Wavefront, P-V:
<λ/4 @ 632nm
Ravg <0.75% @ 900 - 2100nm
Coating Specification:
Ravg <0.75% @ 900 - 2100nm
Damage Threshold, Pulsed:
>5 J/cm2 @ 1064nm, 10ns, 10Hz
Dimensional Tolerance (mm):
Housing Tolerance (mm):
Parallelism (arcsec):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Crystal Quartz and MgF2
Thickness (mm):
6.00 ±0.2
Air Spaced
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

Regulatory Compliance

RoHS 2015:
Reach 224:

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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

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.

Technical Information