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BiBO Crystal & its Applications

Bismuth triborate crystal, BiB3O6 (BIBO), is a relatively recently developed NLO crystal within the borate family, first grown by Liebertz in 1983. In comparison to BBO and LBO, BiBO displays a larger effective nonlinear coefficient. In particular, the nonlinear coefficient of the BiBO crystal is between 3.5 to 4 times greater than that of LBO, and 1.5 to 2 times greater than that of BBO. Furthermore, BiBO exhibits resistance to moisture, which positions it as a promising candidate for frequency doubling applications aimed at producing blue lasers. However, BiBO crystals are generally more expensive than other crystals from the Borate family, such as BBO and LBO.

The top-seeded solution growth (TSSG) technique is utilized for the growth of BiBO single crystals.

For BIBO crystal, the direction (168.9°, 90°) exhibits a larger efficient nonlinear optical (NLO) coefficient than the direction (11.1°, 90°). For a 2.4 mm long, (168.9°, 90°)-cut BIBO, the SHG conversion efficiency can reach 67.7%, while at the same conditions the efficiency of a 4.7 mm long, (11.1°, 90°)-cut BIBO is 58% or so.

In addtion to SFG, OPO/OPA, BiBO crystal has another important application in efficient generation of ultrabright entangled photons through blue pumped spontaneous parametric down conversions (SPDC).

BiBO Crystal Properties

Crystal Structure:

Monoclinic,Point group 2

Lattice Parameter:

a=7.116Å, b=4.993Å, c=6.508Å, β=105.62°, Z=2

Melting Point:

726°C

Mohs Hardness:

5~5.5

Density:

5.033 g/cm³

Thermal Expansion coefficient:

a:4.8x10E-5/K, b:4.4x10E-6/K, c:-2.69x10E-5/K

Transparency Range:

286-2500nm

Absorption Coefficient:

<0.1%/cm at 1064nm

Physical Axis:

X//b,(Z,a)=31.6°,(Y,c)=47.2°

SHG @1064nm-->532nm:

Phase matching angle:

168.9° from z axis in YZ plane(theta=168.9° phi=90°)

Deff:

3.0+/-0.1 pm/V

Angular acceptance:

2.3 mrad-cm

Walk-off angle:

25.6 mrad

Temperature acceptance:

2.2°C-cm

Sellmeier coefficients(λ in µm):

nx²(λ)=3.6545+0.0511/(λ²-0.0371)-0.0226λ²
ny²(λ)=3.0740+0.0323/(λ²-0.0316)-0.01337λ²
nz²(λ)=3.1685+0.0373/(λ²-0.0346)-0.01750λ²

BiBO Crystal Specifications

Dimension Tolerance:

+0/-0.1mm(WxH) and+0.1/-0.2mm thickness

Surface Quality:

10-5 Scratch-dig

Flatness:

<λ/8 @633nm

Chamfer:

0.1mm@45°

Clear Aperture:

Central 90% of Diameter

Parallelism:

<10 arc seconds

Perpendicular:

<10 arc minutes

Orientation Angle:

+/-0.25°

Damage Threshold:

0.3GW/cm²@1064nm10ns

Coating:

Dual wavelength AR coating: R<0.2%

i. BiBO Crystal

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