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Alpha-BBO Crystals
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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. |
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Basic properties
Standard
Products
|
Part No. |
W x H x T(mm) |
Orientation |
Coating |
In stock |
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a-BBO crystals with the thickness < 10 mm
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ALB5005-A |
5 x 5 x 0.05 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB5010-A |
5 x 5 x 0.1 |
a-cut(90o) |
uncoated |
Email/Call |
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ALB5015-A-BBAR800/400 |
5 x 5 x 0.15 |
a-cut(90o) |
AR@(750-850)/(375-425)nm |
Yes |
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ALB5020-A |
5 x 5 x 0.2 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB5050-A |
5 x 5 x 0.5 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB5100-A |
5 x 5 x 1.0 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB5100-A-AR800/400 |
5 x 5 x 1.0 |
a-cut (90o) |
AR@(750-850)/(375-425)nm |
Yes |
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ALB5200-A |
5 x 5 x 2.0 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB5200-A-AR800/400 |
5 x 5 x 2.0 |
a-cut (90o) |
AR@(750-850)/(375-425)nm |
Yes |
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ALB5300-A |
5 x 5 x 3.0 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB5350-45-AR1030/515 |
5 x 5 x 3.5 |
45o-cut |
AR@1030/515nm |
Yes. *OD 0.5" holder |
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ALB5500-A |
5 x 5 x 5.0 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB12005-A |
12.0 x 12.0 x 0.05 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB12010-A |
12.0 x 12.0 x 0.10 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB12020-A |
12.0 x 12.0 x 0.2 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB12050-A |
12.0 x 12.0 x 0.5 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB12100-A |
12.0 x 12.0 x 1.0 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB12100-A-AR1040/520 |
12.0 x 12.0 x 1.0 |
a-cut (90o) |
AR@1040/520nm |
Yes |
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ALB12200-A |
12.0 x 12.0 x 2.0 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB12200-A-AR800/400 |
12.0 x 12.0 x 2.0 |
a-cut (90o) |
AR@800/400nm |
Yes |
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ALB12300-A |
12.0 x 12.0 x 3.0 |
a-cut (90o) |
uncoated |
Email/Call |
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ALB12500-A |
12.0 x 12.0 x 5.0 |
a-cut (90o) |
uncoated |
Email/Call |
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a-BBO crystals with the thickness >= 10 mm
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ABT5100-A |
5 x 5 x 10.0 |
a-cut (90o) |
uncoated |
Email/Call |
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ABT5100-45 |
5 x 5 x 10.0 |
45o-cut |
uncoated |
Email/Call |
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ABT10133-A-AR1550/775 |
10.0 x 10.0 x 13.3 |
45o-cut |
AR@1550/775nm |
Yes |
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ABT12100-A |
12.0 x 12.0 x 10.0 |
a-cut (90o) |
uncoated |
Email/Call |
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ABT12100-45 |
12.0 x 12.0 x 10.0 |
45o-cut |
uncoated |
Email/Call |
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ABT15200-A |
15.0 x 15.0 x 20.0 |
a-cut (90o) |
uncoated |
Email/Call |
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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
ALB5010-A-AR800/400 for the
a-cut a-BBO crystal with the dual AR coating @ 800/400nm.
Substrate:
Ultrathin crystals of thickness 50µm (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
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Wavefront distortion: |
less than
λ/8 @ 633 nm |
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Clear aperture: |
> 90% central area |
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Flatness: |
λ/4 @ 633 nm |
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Surface quality: |
10/5 Scratch/Dig per MIL-O-13830A |
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Parallelism: |
better than 20 arc seconds |
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Perpendicularity: |
10 arc minutes |
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Angle tolerance: |
Δθ
< 0.25o,
Δφ < 0.25o |
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