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Polarizing Beam Displacers

Polarizing Beam Displacers
Polarizing Beam Displacers Polarizing Beam Displacers

 Materials: alpha-BBOCalcite, Quartz or YVO4 single crystal. 
 Two orthogonally polarized outputso-ray transmits directly, 
   e-ray transmits with a displacement.

 High extinction ratio (> 100,000:1) over specified range of wavelength.
a-BBO dispacers are protectively coated, calcite/YVO4 are uncoated.
  Anti-reflective (AR) coating are available upon request.

Standard apertures: 8x8 mm, 10x10 mm, 12x12 mm
 

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Material:
Displacement:
Part No. Description Material Displacement Price Availability Add to Cart


Basic Properties of Calcite Crystal:
 

 Transparency Range: 350 - 2300 nm

material-ca.GIF (10982 bytes)

Transmission Curve

 Crystal Symmetry: Trigonal, R3c
 Lattice Constants: a=b=4,994A, c=17,081A
 Density:  2.71 g/cm3
 Damage Threshold ( 10 ns, 10 Hz)
  - 100 MW/cm2 @ 1064 nm
  - 50 MW/cm2 @ 532 nm
 Optical Homogeneity: Δn < 10-6 /cm
 Mohs Hardness: 3
 Thermal Expansion Coefficients:  αa = 4.9 x 10-6/K
 αc =  25.1 x 10-6/K
 Linear Absorption Coefficients: α<0.01 cm-1 from 400 to 700 nm

 Sellmeier Equations: (λ in µm) :
  no2=2.69705 + 0.0192064/(λ2-0.01820)-0.0151624λ2 
  ne2=2.18438 + 0.0087309/(λ2-0.01018)-0.0024411λ2

 Wavelength(nm) no ne Birefringence
(Δn=ne-no)
Walk-off Angle
 at 45°
1064 1.6423 1.4797 -0.162 5.93°
800 1.6487 1.4821 -0.166 6.06°
632.8 1.6557 1.4852 -0.171 6.18°
532 1.6629 1.4886 -0.174 6.30°
400 1.6823 1.4974 -0.185 6.61°
355 1.6951 1.5032 -0.192 6.82°

 


Basic Properties of alpha-BBO Crystal:
 

 Transparency Range: 189 - 3500 nm

material-abbo.GIF (11478 bytes)

Transmission Curve

 Crystal Symmetry: Hexagonal R3c

 Lattice Symmetry: a=b=7.2351A, c=39.192A

 Density: 3.85 g/cm3
 Thermo-Optic Coefficients:
 dno/dT= - 9.3 x 10-6 /oC
 dne/dT= - 1 6 .6 x 10-6/oC
 Damage Threshold (10 ns, 10 Hz)
  1 GW/cm2
@ 1064 nm,  500 MW/cm2 @ 532 nm
 Optical Homogeneity: Δn < 10-6/cm
 Mohs Hardness: 4.5
 Thermal Expansion Coefficients
 (in the range of 25–900oC)
 αa = 4 x 10-6/K
 αc = 36 x 10-6/K
 Linear Absorption Coefficients: α<0.005 cm-1 from 300 to 2300 nm

 Sellmeier Equations (λ in µm) :
 no2=2.67579+0.02099/(λ2-0.00470)-0.00528λ2
 ne2=2.31197+0.01184/(λ2-0.01607)-0.00400λ2

 Wavelength (nm) no ne Birefringence
(Δn=ne -no)
Walk-off Angle
 at 45°
1550 1.6346 1.5190 -0.116 4.19°
1064 1.6396 1.5225 -0.117 4.23°
800 1.6448 1.5259 -0.119 4.28°
775 1.6456 1.5264 -0.120 4.29°
632.8 1.6513 1.5301 -0.121 4.35°
532 1.6582 1.5347 -0.124 4.42°
400 1.6763 1.5471 -0.129 4.58°
355 1.6876 1.5554 -0.132 4.66°
266 1.7301 1.5900 -0.140 4.81°

 


Basic Properties of YVO4 Crystals:
 

 Transparency Range: 400 - 4000 nm

material-yvo.GIF (11376 bytes)

Transmission Curve

 Crystal Symmetry: Zircon Tetragonal, D4h

 Lattice Constants: a=b=7.12Å; c=6.29 Å

 Density: 4.22 g/cm3
 Thermo-Optic Coefficients:
 dno/dT= 8.5 x 10-6 /oC
 dne/dT= 3.0 x 10-6/oC
 Damage Threshold (10 ns, 10 Hz)
 at 1064 nm 100 MW/cm2
 at 532 nm 50 MW/cm2
 Optical Homogeneity: Δn < 10-6/cm
 Mohs Hardness: 5
 Thermal Expansion Coefficients  αa = 4.4 x 10-6/K
 αc = 11.4 x 10-6/K
 Linear Absorption Coefficient:  α<0.01 cm-1 from 400 to 5000 nm

 Sellmeier Equation (λ in µm):
 no2=3.77834 + 0.069736/(λ2 - 0.04724) - 0.0108133λ2
 ne2=4.59905 + 0.110534/(λ2 - 0.04813) - 0.0122676λ2

 Wavelength(nm) no ne Birefringence
(Δn=ne-no)
Walk-off Angle
 at 45°
1550 1.9447 2.1486 0.204 -5.67°
1300 1.9500 2.1554 0.205 -5.70°
1064 1.9571 2.1650 0.208 -5.74°
800 1.9721 2.1859 0.214 -5.86°
632.8 1.9929 2.2154 0.223 -6.02°
532 2.0177 2.2508 0.233 -6.22°

 


Specifications of polarizing beam displacers:
 

Dimensions Tolerance:   +/- 0.2 mm
Wavefront Distortion:    <  λ/4 @ 632.8nm for
PDC, PDY < λ/6 for PDB

Scratch/Dig:                40/20
Beam Deviation:           < 0.5 arc minutes

Extinction Ratio:           > 100,000:1


 


Displacements:
 

The displacements are wavelength dependent as a result of the dispersion of material indices. The specified displacements are defined at 1550nm for PDC (calcite) and PDY (YVO4), and at 405nm for PDB (a-BBO).
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



Coatings:


Unless the coating is specified, PDB (a-BBO) is coated with single-layer MgF2 protective coating (P-coating) to prevent moisture from the polished faces,  PDC (calcite) and PDY (YVO4) are uncoated.

Input and output faces can be AR coated with R<0.25% at the specified central wavelength.
For the inquiry, please specify the coating and append to the part number, e.g. PDC1040-AR800 for the calcite beam displacer with the AR coating @ 800nm.

Common AR coatings:

α-BBO: 355, 400, 532, 775, 800, 810, 1030, 1064, 1550nm, and dual AR@800/400nm, 1030/515nm,  1064/532nm, 1550/755nm

Calcite: 775, 800, 810, 1064, 1550nm, and dual AR@800/400nm, 1030/515nm,  1064/532nm, 1550/755nm

YVO4: 1064 and 1550nm
 

Mounts:
 

The displacers are mounted in an OD 1" anodized aluminum (Al) mount.  Unmounted displacers or custom mounts are available upon request. 

 

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