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
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, phase retarders,
birefringent plates, time delay compensators especially those involving UV
and high power lasers.
Please specify and add to the part
number, e.g.ATC1210-A-800/400 for
a-cut with AR coating at 800/400nm
Common orientations:
A (a-cut, θ=90o)
45 (θ=45o)
Common coatings:
800/400 (AR@800/400nm)
P (P-coating)
ALB0510
5 x 5 x 0.1
ALB0515
5 x 5 x 0.15
ALB0520
5 x 5 x 0.2
ALB0550
5 x 5 x 0.5
ALB2510
5 x 5 x 1.0
ALB2520
5 x 5 x 2.0
ALB1205
12.7 x 12.7 x 0.05
ALB1210
12.7 x 12.7 x 0.1
ALB1215
12.7 x 12.7 x 0.15
ALB1220
12.7 x 12.7 x 0.2
ALB1250
12.7 x 12.7 x 0.5
ALB2210
12.7 x 12.7 x 1.0
ALB2220
12.7 x 12.7 x 2.0
a-BBO components for ultrafast
applications are highly customized. Please
contact us for a-BBO components that best suit your applications.
Coatings
Protective coating (P-coating): This is a single-layer MgF2 coating.
The primary function of the P-coating is to "protect"
polished a-BBO surfaces from fogging due to
ambient moisture. The protective coating can also partially reduces reflection from polished surface
at a certain wavelength range.
Anti-reflective coating (AR coating): This is a multi-layer dielectric coating. Single-band, dual-band
or broad-band
AR coatings on a-BBO surfaces are available for different applications.
Substrate
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 =< 2.0mm are pre-mounted in a 1" ( 25.4 mm ) anodized aluminium
(Al) holder. A standard 1"
mirror mount may be conveniently used to tune the crystals for optimized
birefringence or time delay
(Mirror mount and post are not included).
A rotation stage may be further used if a larger angle change is needed.
1.5" (38.1mm) holders are available for xtals with large apertures
