• Optic Axis Alignment Not Required
• Ideal for Broadband Light Sources and Large Diameter (>6 mm) Monochromatic Beams
• Air-Gap Design Allows for use with High-Power Beams
• AR Coated for 350 - 700 nm (-A Coating)

This Thorlabs' DPU Series Achromatic Depolarizer converts a polarized beam of light into a pseudo-random polarized beam of light. The term pseudo-random is used since the transmitted beam doesn't become unpolarized; instead the polarization of the beam is randomized. Linearly polarized light from a monochromatic source that is transmitted through a DPU depolarizer will have a polarization that varies spatially. Linearly polarized light from a broadband source that is transmitted through a DPU depolarizer will have a polarization that varies spatially as well as with wavelength. While the DPU-25 is designed for use with linearly polarized light, it will also produce pseudo-random polarization if the input is elliptically or circularly polarized. DPU polarizers will work with light incident on either side of the optic.

This achromatic depolarizer consists 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, which results in an optic with a high damage threshold. This depolarizer has an antireflection coating deposited on all four surfaces. 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 DPU series depolarizer 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.

• Substrate: Quartz Crystal
• Coating: -A Coating (350 - 700 nm)
• Outer Diameter: 1" (25.4 mm)
• Thickness: 7.35 mm (0.289")
• Clear Aperture: >85% of Outer Diameter
• Surface Flatness: λ/10 @ 633 nm
• Surface Quality: 10-5 Scratch-Dig
• Damage Threshold 100 W/cm² CW