BBO
  • BBO

BBO

NLO CRYSTALS


Beta-Barium Borate(BBO)

Since the first discovery of BBO crystal in China, CASTON engineers have been growing and manufacturing BBO crystal. With the latest improved molten salt method, CASTON can produce high quality barium metaborate (BBO) with a maximum size of 25 x 25 x 25mm3 

The product has excellent optical homogeneity.


CASTON'S BBO featured:

● Broad phase-matchable SHG rang from 409.6nm to 3500nm

● Wide transmission region from 190nm to 3500nm

● Large effective second-harmonic-generation (SHG) coefficient

● High damage threshold of 10GW/cm2 for 100 ps pulse-width at 1064nm

● Wide temperature-bandwidth of about 55'℃ ( for type I SHG 1064 nm )

● Good mechanical and physical properties


CASTON'S BBO applied to:

● Second, third, fourth and fifth harmonics generations of Nd : lasers

● Frequency-doubling,-tripling and -mixing of Dye lasers

● Second,third & fourth harmonics generations of Ti : Al2O3 and Alexandrite lasers

● Optical parametric amplifiers(OPA) and optical parametric oscillators(OPO)

● Frequency-doubling,-tripling og ultrashort pulse Ti : Sapphire and Dye lasers

● Frequency-doubling of Argon ion,Cu-vapor and Ruby lasers

● External intracavity SHG


Structure and physical properties:


crystal structure

trigonal, space group R 3C

cell parametersa=b=12.532nm,c=12.717nm,z=6
melting point1095±5°C
mohs hardness4.5
density3.85g/cm3
transparency range190~3500nm
thermal coefficient

Snx10-6/cm

angle acceptance

0.8mrad·cm(θ,Ⅰ类晶体,1064 SHG)

1.27mrad·cm(θ,Ⅱ类晶体,1064 SHG)

Thermo-optic coefficient

dn0/dT=-16.6x10-6C

Cdne/dT=-9.3x10-6/°C

Coefficient of thermal expansiona11=4x10-6/K,a33=36x10-6/K


CASTON Standard Specification:



wavefront distortion

<1/8 λ

maximum crystal sizcrystal length from 0.01mm to 35mm and size up to 20x20x20mm3
section tolerance+0.1mm/-0.1mm
length tolerance+0.2mm/-0.2mm
chamfer0.1mm@45°
flatness<1/10 λ at 633mm
parallelism<10 arc second
verticality<5  are min


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