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
Glan Taylor
Glan Laser

Glan Thompson

UV Glan Thompson
Brewster Angle
Glan Thompson Beam Splitting
Glan Laser Combining Splitting
Glass Calcite Rochon
Wollaston
Beam Displacer
IR Plate
MAGNESIUM FLUORIDE POLARIZERS
Rochon
CRYSTAL QUARTZ POLARIZERS
Rochon
Wollaston
RETARDATION DEVICES
Crystal Quartz
Magnesium Fluoride
Achromatic
Mica
Fresnel Rhomb
Babinet Soleil Compensator
Fixed Rotator
SCRAMBLER
Calcite Scrambler
Quartz Scrambler
Magnesium Fluoride Scrambler
THIN FILMS
Narrow Band Polarizing Cube
Broad Band Polarizing Cube
Thin Film Optical Isolator
Thin Film Beam Displacer
Anti Reflection Coating
MOUNTING DEVICES
Rotary Stage
GLASS COMPONENTS
Coupling Prism

BROAD BAND POLARIZING CUBES

 

For a beam of light incident on a surface at normal incidence, polarization properties of the reflected and transmitted beams are described by Fresnel's equations. According to these, if angle of incidence is equal to Brewster's angle, the degree of polarization of reflected -s beam ( perpendicular to plane of incidence ) is unity. The transmitted -p ( parallel to plane of incidence ) beam is partially polarized. Polarization of the transmitted beam can be further purified by successive films each of suitable thickness and refractive index so that Brewster's condition at each interface is met. In actual practice this does not happen which limits the performance of thin film polarizing cubes. 

The standard available cube sizes are 5, 12, 25 and 50 mm. Standard central wavelengths are 550, 830, 1100 and 1400 nm. These are all made of SF2 substrate. Other sizes and wavelengths are available on special order. All outside faces of the cubes are broad band single layer magnesium fluoride anti-reflection coated ( 1.5 % average reflectivity per surface in respective wavelength ranges as shown in following plots ). Please visit our Anti-Reflection Coating page on this web site for various reflectivity plots.

The extinction of transmitted -p component is at least 1 part in 500. As shown in the following plots, some of the transmitted -p polarization is reflected which degrades the extinction of -s polarization. Almost all -s polarization is reflected. Wavefront deformation of the transmitted -p beam is at least quarter wave at 633 nm.

 

The cube shown above is made of two 90 degree prisms. The prism with the dot as shown above has the polarizing coating on its diagonal and should be on the input side of the beam for optimum performance.

 

BBPC*-550nm

BBPC*-830nm

BBPC*-1100nm

BBPC*-1400nm

Specifications :

 

average extinction of -p : % transmission of -s in above plots - 1/ 500 ( .2% -s transmission ) 
wavefront distortion of -p : quarter wave at 632.8 nm
beam deviation of -p : 5 arc minutes or less
beam deviation of -s : 90 degrees +/- 15 arc minutes
surface quality : 40-20 scratch dig
coating : 1.5% average reflectivity per surface in above given wavelength ranges

 

Some of the transmitted -p polarization is reflected and is on top of -s polarization. Although these polarizing cubes reflect almost all the -s polarization, the extinction of -s is poor since some the -p is reflected and is on top of -s. These cubes are excellent as beam combiners.

 

 

BROAD BAND POLARIZING BEAM SPLITTER CUBES

Catalog Number

Clear Aperture Diameter ( mm ) Substrate

Standard

Central

Wavelength (nm)

WL*

Cube Dimensions

( Inches)

+/- .25 mm

BBPC5-WL* 5 SF2

550

830

1100

1400

5*5*5
BBPC12-WL* 12 SF2 12.7*12.7*12.7
BBPC25-WL* 25 SF2 25.4*25.4*25.4
BBPC50-WL* 50 SF2 50*50*50