Waveplates for Precision Polarization Control

Achromatic Waveplate

Achromatic Waveplate

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Sold by: Union Optic Ships from: China
Specifications
Waveplate Type (Retardation Order): Achromatic
Material: Quartz and MgF2
Mounting: Mounted, Unmounted
Shape: Round, Square, Rectangle, Custom
Size (Largest Dimension): 10 mm

Did You Know?

A wave plate (retarder or phase shifter) is an optical element which changes the polarization of the light wave that passes through. Wave plates work by shifting the phase between two perpendicular polarization components of the light wave. A common configuration of a wave plate is a plane-parallel substrate of birefringent crystal, typically quartz, mica, or magnesium fluoride. Wave plates come in configured for different retardations such as a quarter, half or full wave. A quarter wave plate changes linear polarization to circular, while a half wave plate changes the handedness of the circular polarization. By using different combinations it is possible to isolate one or two wavelengths simultaneously, eliminate or compensate for ellipticity and even rotate one wavelength relative to another. The utility of wave plates depends upon a number of factors such as operating temperature range, wavelength bandwidth, damage threshold, etc.
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Frequently Asked Questions

A waveplate (retarder) is an anisotropic optical element that exploits birefringence to introduce a controlled phase delay between orthogonal polarization components of a light beam. When linearly polarized light enters at some angle to the crystal’s fast and slow axes, the differing refractive indices produce a relative phase shift, converting the output polarization to linear at a new angle, elliptical, or circular depending on the retardance and input orientation.

What Are Waveplates?

Waveplates are birefringent optical components that introduce a controlled phase delay between orthogonal polarization components of a light beam. By exploiting the difference in refractive indices along the fast and slow axes, waveplates convert linear to circular polarization, rotate polarization angles, or compensate for polarization distortions in optical systems.

Common types of waveplates include quarter-wave plates (λ/4) for generating or analyzing circular and elliptical polarization, and half-wave plates (λ/2) for rotating linear polarization. Multi-order, zero-order, and achromatic waveplates are available to suit different bandwidth and environmental requirements.

Typical Specifications for Waveplates

When selecting waveplates on FindLight, engineers typically review:

  • Material: Crystal quartz, MgF2, sapphire, and polymer or liquid crystal waveplates for tunable or broadband operation.
  • Design type: True zero-order, compound zero-order, multiple-order, and achromatic waveplates for narrowband or broadband sources.
  • Wavelength range: UV, visible, NIR, or IR; specified central wavelength and usable bandwidth.
  • Retardance tolerance: Deviation from nominal λ/2 or λ/4 (e.g., ±λ/300) over the specified wavelength and temperature range.
  • Clear aperture and diameter: To match beam size and mechanical constraints in the optical train.
  • Surface quality and flatness: Scratch-dig (e.g., 20-10, 40-20) and λ/10 flatness for high-quality imaging or high-power laser use.
  • Coatings: AR coatings optimized for the operating band to reduce reflection losses and ghosting.
  • Damage threshold: Particularly relevant for pulsed or high-power CW laser applications.

Use Cases and Buyer Guidance

Waveplates are used in laser polarization control, interferometry, microscopy, ellipsometry, optical isolators, and telecom components. Half-waveplates are common in rotating polarization before polarizing beam splitters, while quarter-waveplates are used in converting between linear and circular polarization in free-space communication and metrology.

When comparing waveplates, match retardance type and wavelength range to your source, confirm clear aperture against beam diameter, and check coating performance over your operational band. Evaluate environmental stability, mount compatibility, and damage threshold for high-power or field-deployed systems.

On FindLight you can browse multiple manufacturers of waveplates, compare detailed datasheets and specifications, and request quotes directly from suppliers. No registration is required to contact vendors, streamlining sourcing for R&D labs, OEM integration, and production environments.