Introduction - THORLABS SBC-VIS Operation Manual

Soleil-Babinet Compensator Operations Manual – Doc # N0073-D01 Rev A Ver 1.4

1.0 Introduction

The Soleil-Babinet Compensator is a continuously variable, zero order retarder (waveplate) which operates over a
broad wavelength range. The classical design of the compensator consists of a long birefringent wedge mounted
on an adjustable slide. A fixed wedge mounted to a compensator plate completes the optical system. The
retardance is adjusted by moving the position of the long wedge relative to the short wedge using a precision
digital micrometer. This allows the retardance to vary continuously while maintaining a uniform retardance across
the aperture at any given setting (see Appendix B Theory of Operation for more details).
Thorlabs offers three models: the SBC-VIS and SBC-IR use quartz optics to cover a spectral range of 400-
1000nm and 1000-2000nm respectively. The SBC-UV uses magnesium fluoride optics to extend the compensator
range into the UV from 140nm to 400nm.
Our standard Soleil-Babinet Compensators are uncoated for broad spectral operation. To minimize reflection
losses when using the compensator over narrow wavelength ranges, AR-coated versions are available upon
special request.
Applications include birefringence compensation, precision retardance measurements and high resolution
ellipsometry.
Standard features of all the compensator versions include:
Table 1-1 Standard Features
•
Continuously Variable Retardance
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Uniform Retardance over Full Aperture
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3 Wavelength Ranges (UV, VIS, IR)
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Digital Micrometer Readout
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Graduated Rotation Ring with Vernier Readout
•
45° Index Stops for Rapid Setup
•
Adjustable Kinematic Tilt Adjustment
•
Optional RS-232 Interface & Software available
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