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Achromatic Depolarizers

Features:

  • Optic Axis Alignment Not Required
  • Ideal for Broadband Light Sources and Large Diameter (>6 mm) Monochromatic Beams
  • Air-Gap Design or Cemented
  • Available Uncoated (190 - 2500 nm) or with One of Three AR Coatings
  • Customized size and wavelength are available upon request.

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Specifications:

Material Quartz 200-2500nm Dimension Tolerance ±0.2mm
Surface Quality Better than 60/40 S/D Beam Deviation <3 arc minutes
Wavefront Distortion <λ/4@632.8nm Clear Aperture >90% central
Coating Uncoated, AR coating available
 

Modules or Types:

Part No. Wavelength Range (nm) Diameter (mm)
DOP4012 200-2500 12.7
DOP4025 200-2500 25.4

Note: Other sizes and wavelengths are available upon requirement

 

Achromatic depolarizers consist of two crystal quartz wedges, one of which is twice as thick as the other, that are separated by a thin metal ring. The assembly is held together by epoxy that has been applied only to the outside edge (i.e., the clear aperture is free from epoxy), which results in an optic with a high damage threshold. These depolarizers are available uncoated for use in the 190 - 2500 nm range or with one of three antireflection coatings deposited on all four surfaces (i.e., both sides of the two crystal quartz wedges). Choose from AR coatings for the 350 - 700 nm (-A coating), 650 - 1050 nm (-B coating), or 1050 - 1700 nm (-C coating) range.

The optic axis of each wedge is perpendicular to the flat for that wedge. The orientation angle between the optic axes of the two quartz crystal wedges is 45°. The unique design of the quartz-wedge depolarizers eliminates the need to orient the optic axes of the depolarizer at any specific angle, which is especially useful if the depolarizer is used in an application where the initial polarization of the light is unknown or varies with time.