Variable Rotator

Theory　　　　　　　　　　　　　　　　　　　　　　

The VR100 Variable Rotator is constructed from two　leftrotating opposed crystal quartz wedges with a　compensating right-rotating crystal block in optical　contact with the smaller wedge. Both wedges and　the compensating block are cut with the optic axis　parallel to the beam propagation direction. In　operation, the large wedge is translated across the　smaller, thus presenting a variable amount of left　rotation to an optical beam passing through the　Instrument. The compensating block introduces the exact opposite right rotation when the instrument is set　at the zero position.
The input beam propagates through both wedges, and suffers a rotation of its plane of polarization　proportional to the difference in thickness between the two combined wedges and the compensating.

Model VR100
This rotator,using natural optically active crystal quartz elements,is designed for use over the wavelength　range 230nm-1100nm,covering the mostpopular laser wavelengths from Nd:YAG 4th harmonic @ 266nm　to the fundamental @ 1064nm. The variable rotator is factory preset for zero rotation at the micrometer　zero position, and we supply a calibration curve for the calculation of rotation vs micrometer setting at any wavelength within 230nm-1100nm.
Note that this variable rotator is completely linear:i.e.at a given wavelength, rotation scales in direct　proportion to the micrometer reading.

Specifications:

Aperture (mm): ---------------------------------------------------------- 10
Spectral Range (nm): -------------------------------------------------- 230-1100
Rotation range:------------------------------------------------------- 0°-90°
Calibration accuracy:--------------------------------------------------- +/-1°

Polarization Rotators

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