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Soleil-Babinet Compensators

Soleil-Babinet Compensators

A Soleil-Babinet compensator can be regarded as a retarder with variable path difference. It can be used for the determination of polarization states as well for the realization of arbitrary values of retardation.

The compensators are comprising a movable long wedge as well as a short wedge and compensation plate which are mounted with fixed position. The crystal axes of the compensator plate is aligned at 90° with respect to the axes of the wedges. This allows to achieve zero order retardation values. The sum of the center thickness of the wedges equals the thickness of the compensator plate. Therefore, the path difference is zero in the center position and the compensator can be set to retardation value of both signs. The path difference depends linearly on the displacement of the wedge. The wedge position can adjusted and determined precisely by means of a micrometer screw.

We offer several models made either from quartz crystal or from MgF 2 an with different wedge angles. Small wedge angles grant a higher resolution of the path difference. However, for most applications the wedge angle has to large enough to obtain an adjustment range of at least ±λ/2 at the operation wavelength λ. The conditions determine the recommended spectral range.

Optical specifications

Modell RKM 07 RKQ 10 RKQ 22 RKM 70
material MgF2 quartz quartz MgF2
recommended spectral range 130-1000 nm 250-1800 nm 500-2500 nm 2000-7000 nm
wedge angle 0,25° 0,5° 1,25° 5,5°
adjustment range > ±633 nm > ±900 nm > ±2100 nm > ±6800 nm
flatness <λ/10 <λ/20 <λ/20 <λ/10

Standard dimensions

Art. No. RKM 07 RKQ 10 RKQ 22 RKM 70
free aperture 12 mm 12 mm 12 mm 12 mm
lateral displacement ± 12,5 mm ± 12,5 mm ± 12,5 mm ± 12,5 mm
graduation of the micrometer 10µm 10µm 10µm 10µm
mounting diameter 25 mm 25 mm 25 mm 25 mm

Version from quartz

order no. 1 piece in € 2 piece in € 3-5 piece in €
RKQ 10 3310.- 3055.- 2851.-
RKQ 22 3867.- 3437.- 3094.-

Version from MgF2

order no. 1 piece in € 2 piece in € 3-5 piece in €
RKM 07 4696.- 4109.- 3639.-
RKM 70 5170.- 4523.- 4007.-

Price custom version

option order-no.: additional price in EUR
calibration of slope and zero position
available at selected wavelengths(e.g. 633nm, 546 nm, 435 nm)
RKQ 001 164.- price per wavelength
rotational mount MTK 113 see site rotational mount
motorized or digital micrometer screw --- on request