Polarizing Beam Displacers

Materials: alpha-BBO, Calcite, Quartz or YVO₄ single crystal.
Two orthogonally polarized outputs, o-ray transmits directly,
e-ray transmits with a displacement.
High extinction ratio (> 100,000:1) over specified range of wavelength.
alpha-BBO dispacers are protectively coated, calcite/YVO₄ are uncoated.
Anti-reflective (AR) coatings are available upon request.
Standard apertures: 8x8 mm, 10x10 mm, 12x12 mm.
Displacement range: 0.001 -- 4.0mm.

Application Example:

Large a-BBO displacers for Strong Loophole-free Test of Local Realism

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Part No.	Description	Application	Material	Wavelength	Bandwidth	Size	Aperture	Thickness	Length	Angle	Doping	Orientation	Displacement	Retardation	Delay	Coating	End cut	Holder	Price	Availability	Add to Cart

Basic Properties of alpha-BBO Crystal:

Transparency Range: 189 - 3500 nm			Transmission Curve (UNCOATED)
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 25–900^oC)			α_a = 4 x 10^-6/K α_c = 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)	n_o	n_e	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 Calcite Crystal:

Transparency Range: 350 - 2300 nm			Transmission Curve (UNCOATED)
Crystal Symmetry: Trigonal, R3c
Lattice Constants: a=b=4,994A, c=17,081A
Density: 2.71 g/cm3
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: 3
Thermal Expansion Coefficients:			αa = 4.9 x 10-6/K αc = 25.1 x 10-6/K
Linear Absorption Coefficients: α<0.01cm-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°
1550	1.6336	1.4772	-0.156	5.73°
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°

* Calcite crystal is a natural mined material, not synthetic material. Defects in a calcite crystal (a large and thick crystal in particular) can cause scattering and absorption within the bulk.

Basic Properties of YVO₄ Crystals:

Transparency Range: 400 - 4000 nm			Transmission Curve (UNCOATED)
Crystal Symmetry: Zircon Tetragonal, D4h
Lattice Constants: a=b=7.12Å; c=6.29 Å
Density: 4.22 g/cm³
Thermo-Optic Coefficients: dn_o/dT= 8.5 x 10^-6 /^oC dn_e/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			α_a = 4.4 x 10^-6/K α_c = 11.4 x 10^-6/K
Linear Absorption Coefficient: α<0.01 cm^-1 from 400 to 5000 nm
Sellmeier Equation (λ in µm): n_o²=3.77834 + 0.069736/(λ² - 0.04724) - 0.0108133λ² n_e2=4.59905 + 0.110534/(λ² - 0.04813) - 0.0122676λ²
Wavelength(nm)	n_o	n_e	Birefringence (Δn=n_e-n_o)	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 standard polarizing displacers are mounted in an OD 1" anodized aluminum (Al) mount. Unmounted displacers or custom mounts are available upon request.

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