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Alpha-BBO Crystals

High temperature phase BBO ( alpha-BBO, a-BBO) is a negative uniaxial crystal with a large birefringence over the broad transparent range from 189 nm to 3500 nm. The physical, chemical, thermal and optical properties of alpha-BBO crystal are similar to those of low temperature phase beta-BBO. There is no second order nonlinear effect in alpha-BBO crystal due to the centric symmetry in its crystal structure and thus it has no use for NLO processes. Instead, alpha-BBO is widely used for fabrication of polarizers, polarizing beam displacers, phase retarders, birefringent plates, and time delay compensators especially those involving UV and high power lasers.

Basic properties

Standard Products

Part No. W x H x T(mm) Orientation Coating In stock
a-BBO crystals with the thickness < 10 mm 
ALB5005-A  5 x 5 x 0.05 a-cut (90o) uncoated Email/Call
ALB5010-A 5 x 5 x 0.1 a-cut(90o) uncoated Email/Call
ALB5015-A-BBAR800/400 5 x 5 x 0.15 a-cut(90o) AR@(750-850)/(375-425)nm Yes
ALB5020-A  5 x 5 x 0.2 a-cut (90o) uncoated Email/Call
ALB5050-A 5 x 5 x 0.5 a-cut (90o) uncoated Email/Call
ALB5100-A 5 x 5 x 1.0 a-cut (90o) uncoated Email/Call
ALB5100-A-AR800/400 5 x 5 x 1.0 a-cut (90o) AR@(750-850)/(375-425)nm Yes
ALB5200-A 5 x 5 x 2.0 a-cut (90o) uncoated Email/Call
ALB5200-A-AR800/400 5 x 5 x 2.0 a-cut (90o) AR@(750-850)/(375-425)nm Yes
ALB5300-A 5 x 5 x 3.0 a-cut (90o) uncoated Email/Call
ALB5350-45-AR1030/515 5 x 5 x 3.5 45o-cut AR@1030/515nm Yes. *OD 0.5" holder
ALB5500-A 5 x 5 x 5.0 a-cut (90o) uncoated Email/Call
ALB12005-A  12.0 x 12.0 x 0.05 a-cut (90o) uncoated Email/Call
ALB12010-A 12.0 x 12.0 x 0.10 a-cut (90o) uncoated Email/Call
ALB12020-A  12.0 x 12.0 x 0.2 a-cut (90o) uncoated Email/Call
ALB12050-A 12.0 x 12.0 x 0.5 a-cut (90o) uncoated Email/Call
ALB12100-A 12.0 x 12.0 x 1.0 a-cut (90o) uncoated Email/Call
ALB12100-A-AR1040/520 12.0 x 12.0 x 1.0 a-cut (90o) AR@1040/520nm Yes
ALB12200-A 12.0 x 12.0 x 2.0 a-cut (90o) uncoated Email/Call
ALB12200-A-AR800/400 12.0 x 12.0 x 2.0 a-cut (90o) AR@800/400nm Yes
ALB12300-A 12.0 x 12.0 x 3.0 a-cut (90o) uncoated Email/Call
ALB12500-A 12.0 x 12.0 x 5.0 a-cut (90o) uncoated Email/Call
a-BBO crystals with the thickness >= 10 mm 
ABT5100-A 5 x 5 x 10.0 a-cut (90o) uncoated Email/Call
ABT5100-45 5 x 5 x 10.0 45o-cut uncoated Email/Call
ABT10133-A-AR1550/775 10.0 x 10.0 x 13.3 45o-cut AR@1550/775nm Yes
ABT12100-A 12.0 x 12.0 x 10.0 a-cut (90o) uncoated Email/Call
ABT12100-45 12.0 x 12.0 x 10.0 45o-cut uncoated Email/Call
ABT15200-A 15.0 x 15.0 x 20.0 a-cut (90o) uncoated Email/Call
ABT15200-45 15.0 x 15.0 x 20.0 45o-cut uncoated Email/Call



a-BBO components for ultrafast applications are highly customized. Please contact us for a-BBO components  that best suit your applications.


Prisms:

a-BBO crystals with a wedge angle (α ) can be custom fabricated with the specified orientation of the optical axis. A paired or such prisms with the optical axes orthogonal to each other can be used to continuously adjust the phase shift or time delay between two orthogonally polarized pulses.  


Coatings:

a-BBO crystals are uncoated unless the coating is specified.

a-BBO crystals can be coated with a protective coating (P-coating) or anti-reflection coating (AR coating) upon request. P-coating is a single layer MgF2 coating with the primary function of protecting polished a-BBO surfaces from fogging due to ambient moisture. P-coating can also partially reduces reflection from polished surface at a certain wavelength range. AR coating is a multiple layer dielectric coating with R<0.25% at the specified wavelength(s). AR coating also protects the surfaces from ambient moisture.

Typical P-coating curve:
P-coating
Typical AR coating curve:
AR800/400nm


Please specify the coating and append to the part number, e.g.
ALB5010-A-P for the a-cut a-BBO crystal with P-coating, and
ALB
5010-A-AR800/400 for the a-cut a-BBO crystal with the dual AR coating @ 800/400nm.

Substrate:

Ultrathin crystals of thickness 50m (0.05mm) or thinner are supplied optically contacted on UV fused silica substrates with a typical thickness of 2.0mm.

Mount:

For customer convenience and protection of crystals, all crystals with the thickness =< 3.0mm are pre-mounted in a 1" ( 25.4 mm ) anodized aluminum holder.   A standard 1" mirror mount may be conveniently used to tune the crystals for optimized birefringence or time delay. A rotation stage may be further used if a larger angular change is needed.

0.5" (12.7mm) holders for smaller crystals and 1.5" (38.1mm)  holders for larger crystals are available upon request.
 

Specifications on finished alpha-BBO crystals

Wavefront distortion: less than λ/8 @ 633 nm
Clear aperture: > 90% central area
Flatness: λ/4 @ 633 nm
Surface quality: 10/5 Scratch/Dig per MIL-O-13830A
Parallelism: better than 20 arc seconds
Perpendicularity: 10 arc minutes
Angle tolerance: Δθ < 0.25o, Δφ < 0.25o


 

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