Karl Lambrecht Corporation

4204 N. Lincoln Ave., Chicago, IL 60618.

Phone : 773-472-5442 / Fax : 773-472-2724

email : sales@klccgo.com / website : www.klccgo.com

crystal polarizers

retardation devices

scramblers

thin film polarizers

anti-reflection coatings

rotary stages

 

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CALCITE POLARIZERS
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MAGNESIUM FLUORIDE POLARIZERS
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RETARDATION DEVICES
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SCRAMBLER
Calcite Scrambler
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THIN FILMS
Narrow Band Polarizing Cube
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Rotary Stage
GLASS COMPONENTS
Coupling Prism

MICA WAVEPLATES

 

When any form of polarized light is incident on a birefringent waveplate, it is resolved into two linearly polarized components which vibrate perpendicular to each other and travel with different velocities in the crystal. The beams emerge with a phase delay. This phase delay or retardation is dependent on birefringence of the crystal. Birefringence at a specified wavelength is the difference in refractive indices of the extraordinary and ordinary resolved components. Because of dispersion of birefringence i.e. it's dependence on wavelength, there is a variation of retardation with wavelength. 

Quarter and half wave mica waveplates are available as a thin cleaved zero order retarder at a specified wavelength between 450 to 1600 nm cemented between BK7 glass plates or as bare mica,  V type anti-reflection coated and mounted in a cell. Mica is a bi-axial, optically inactive crystal which has about 3 to 5 % absorption in the visible region of the spectrum. The cemented mica retarders are available in  clear aperture diameters of 10 and 22 mm while bare mica retarders are available in a clear aperture diameter of 25 mm only. Special sizes are available upon request.

 

mica quarter wave retarder with fast axis marked on the cell

SENSITIVITY TO RETARDATION OF MICA RETARDERS ( ACTUAL )

WAVEPLATE BETWEEN TWO OPEN POLARIZERS AT 45 DEGREES AZIMUTH - % INTENSITY VS WAVELENGTH 

MWPMP2-22-550-V ( HALF WAVE @ 550 NM )

MWPMP2-22-1550-V ( HALF WAVE @ 1550 NM

 

Specifications :

 

surface flatness

: at least quarter wave @ 633 nm over the clear aperture

surface quality

: 40-20 scratch dig
retardation error* : less than 5 nm
reflectivity per surface : uncoated about 4%; V coated less than .25%
    please visit Anti Reflection Coating page for reflectivity plots of available coatings

 

* Retardation of a waveplate as well as retardation error is dependent on wavelength e.g. a .5 wave retarder at 200 nm will have .525 waves of retardation at 195 nm while a .5 wave retarder at 1500 nm will have .502 wave retardation at 1495 nm. In other words, a 5 nm change in wavelength at 200 and 1500 nm changes retardation by .025 and .002 waves respectively. Therefore, it is difficult to specify retardation error of all waveplates by one number.

 

 

CEMENTED MICA QUARTER AND HALF WAVE RETARDERS

Catalog Number

Clear 

Aperture

Diameter 

(mm)

Unmounted Dimensions

Retardation

in waves

Single

Wavelength

in nm

Between

450-1600 nm

Type of

Anti

Reflection

Coating

Mount Dimensions

( Inches)

Remarks

Diameter

+0 / -.2

Thickness

+/- .5 mm

Outside

Diameter

+/- .002

Length

+/- .005

WPMP4-10-WL-UN 10 12.6 3.5 Quarter WL Uncoated .625 .375

Beam Deviation

3 Arc Minutes

 

Retardation

Error 5 nm

 

Wavefront

Quarter Wave

@ 633 nm

 

WPMP4-10-WL-BB 10 12.6 3.5 Quarter WL BB Coated .625 .375
WPMP4-10-WL- V 10 12.5 3.5 Quarter WL V Coated .625 .375
WPMP2-10-WL-UN 10 12.6 3.5 Half WL Uncoated .625 .375
WPMP2-10-WL-BB 10 12.6 3.5 Half WL BB Coated .625 .375
WPMP2-10-WL- V 10 12.6 3.5 Half WL V Coated .625 .375
WPMP4-22-WL-UN 22 25.3 5.0 Quarter WL Uncoated 1.125 .500
WPMP4-22-WL-BB 22 25.3 5.0 Quarter WL BB Coated 1.125 .500
WPMP4-22-WL- V 22 25.3 5.0 Quarter WL V Coated 1.125 .500
WPMP2-22-WL-UN 22 25.3 5.0 Half WL Uncoated 1.125 .500
WPMP2-22-WL-BB 22 25.3 5.0 Half WL BB Coated 1.125 .500
WPMP2-22-WL- V 22 25.3 5.0 Half WL V Coated 1.125 .500
 Cemented mica waveplates are supplied unmounted. Optional mounts for these are available upon request.
 

UNCEMENTED BARE MICA

QUARTER AND HALF WAVE RETARDERS

Catalog Number

Clear 

Aperture

Diameter 

(mm)

Retardation

in waves

Single

Wavelength

in nm

Between

450-1600 nm

Type of

Anti

Reflection

Coating

Mount Dimensions

( Inches)

Depending on retardaion, thickness of mica varies from 25 to 200 micrometers

Remarks

Outside

Diameter

+/- .002

Length

+/- .005

MWPUM4-25-WL-V 25 Quarter WL V Coated 1.500 .375

Beam Deviation

10 Arc Seconds

 

Retardation

Error 5 nm

 

Wavefront

10th Wave

@ 633 nm

MWPUM2-25-WL-V 25 Half WL V Coated 1.500 .375