- Measurement of Unknown Retardances
- High-Resolution Ellipsometry
- Birefringence Compensation
- Uniform Retardance Over Full Aperture
- Continuously Variable Retardance from 0 to 2π
- Graduated Rotation Ring and Digital Micrometer Aid Repeatability
- 45° Detent Index Stops
- Options for 365 - 800 nm or 740 - 1650 nm
The Soleil-Babinet Compensator is a continuously variable, zero-order retarder (wave plate) that operates over a broad wavelength range. The classical design of the compensator consists of a long birefringent wedge and a fixed wedge mounted to a compensator plate. The retardance is adjusted by moving the position of the long wedge relative to the short wedge using the included precision digital micrometer. This allows the retardance to vary continuously while maintaining a uniform retardance across the aperture at any given setting.
Crystalline quartz optics are used in both Soleil-Babinet Compensator models. The visible (SBC-VIS) and infrared (SBC-IR) models are designed for the 365 - 800 nm and 740 - 1650 nm spectral ranges, respectively.
Our standard Soleil-Babinet Compensators are uncoated for broad spectral operation. To minimize reflection losses when using the compensator over narrow wavelength ranges, we offer AR-coated versions upon request. Please contact Technical Support for more information on this option.
The included digital micrometer has a Ø3/8" (Ø9.5 mm) mounting barrel and offers 1" (25.4 mm) of travel. To motorize an SBC, a Z825B DC servo motor can be used in place of the standard micrometer. Alternatively, Thorlabs' Liquid Crystal Variable Retarders may be a suitable alternative to a motorized SBC.