Overview: BBO (beta-BaB2O4) is a nonlinear optical crystal which combines a number of unique
features. These features include wide transparency and phase
matching ranges, large nonlinear coefficient, high damage threshold
and excellent optical homogeneity. Therefore, BBO is an excellent
nonlinear crystal for frequency-doubling of Visible and Near IR
laser light, OPO/OPG/OPA pumped by ultrafast pulses of wavelengths
in the Near IR to UV, and sum-frequency mixing (SFM) into the
Visible to the deep UV. BBO is one of the few practical crystals
for use below 500 nm in SHG and SFM. BBO crystal is also an excellent electro-optic crystal for high
power applications at the wavelength range from 200nm to 2500nm. It
can be used for Q-Switching in a CW diode pumped Nd:YAG laser with
average power>50W. General Specifications Of BBO crystals: | Dimension Tolerance | (W±0.1mm) x (H±0.1mm) x (L±0.2mm) | | Angle Tolerance | Δθ<0.5°, ΔΦ<0.5° | | Surface Quality | 20/10 Scratch and Dig | | Clear Aperture | >90% central | | Surface Flatness | <λ/8@633nm | | Wavefront Distortion | <λ/4@633nm | | Parallelism | <20 arc seconds | | Perpendicularity | <5 arc minutes | | Chamfer | <0.1mmx45° |
Standard Products of BBO crystals: | PN. | Dimension (mm) | Length (mm) | θ(Deg) | φ(Deg) | Coating | Application | | BBO447/22.8/0/SHG1064-Ⅰ | 4X4 | 7 | 22.8 | 0 | AR/AR@1064&532nm | SHG@1064, TypeⅠ | | BBO447/47.6/0/4HG1064-Ⅰ | 4X4 | 7 | 47.6 | 0 | AR/AR@532&266nm | 4HG@1064,TypeⅠ | | BBO4410/22.8/0/SHG1064-Ⅰ | 4X4 | 10 | 22.8 | 0 | AR/AR@1064&532nm | SHG@1064, TypeⅠ | | BBO4410/47.6/0/4HG1064-Ⅰ | 4X4 | 10 | 47.6 | 0 | AR/AR@532&266nm | 4HG@1064, TypeⅠ | | BBO551/29.2/0/SHG800-Ⅰ | 5X5 | 1 | 29.2 | 0 | AR/AR@800&400nm | SHG@800, TypeⅠ | | BBO550305/29.2/0/SHG800-Ⅰ | 5X5 | 0.3-0.5 | 29.2 | 0 | AR/AR@800&400nm | SHG@800, TypeⅠ |
Physical and Optical Properties of BBO crystals: | Crystal Structure | trigonal, space group R3c | | Cell Parameters | a=b=12.532Å, c=12.717Å, Z=6 | | Melting Point | 1095±5oC | | Transition Temperature | 925±5oC | | Optical Homogeneity | 10-6/cm | | Mohs Hardness | 4.5 | | Density | 3.85g/cm3 | | Linear Absorption Coefficient | <0.1%/cm (at 1064 nm) | | Hygroscopic Susceptibility | low | | Resistivity | >1011 ohm/cm | | Relative Dielectric Constant | eT11/e0: 6.7, eT33/e0: 8.1
Tan d,<0.001 | | Thermal Expansion Coefficients(in the range of 25-900℃) | ⊥c, 4 x 10-6/K; ||c, 36 x 10-6/K | | Thermal Conductivity | ⊥c, 1.2 W/m/K; ||c, 1.6 W/m/K | | Transparency Range | 189-3500nm | | Therm-Optic Coefficients | dno/dT=-9.3x10-6/0C; dne/dT=-16.6x10-6/0C | | NLO coefficients | d11 =5.8 x d36(KDP)
d31 = 0.05 x d11, d22<0.05 x d11 | | Electro-Optic Coefficients | g11=2.7 pm/V, g22, g31<0.1 g11 | | Half-Wave Voltage | 48 KV (at 1064nm) | | Phase-matchable SHG range | 189-1750nm | | Damage Threshold | @1.064um | 5 GW/cm2 (10 ns); 10 GW/cm2 (1.3 ns) | | @0.532um | 1 GW/cm2 (10 ns); 7 GW/cm2 (250 ps) | | @0.266um | 120 MW/cm2 (8ns) | | Sellmeier Equations(λ in um) | no2(λ) = 2.7359+0.01878/(λ2-0.01822)-0.01354λ2
ne2(λ) = 2.3753+0.01224/(λ2-0.01667)-0.01516λ2 |
Standard Parameter for Different Application: | Harmonic generations of Nd:YAG lasers | | 1064nm SHG-> 532nm | 4x4x7mm | Type I, Theta=22.8deg, Phi=0deg | | 1064nm THG-> 355nm | 4x4x7mm | Type I, Theta=31.3deg, Phi=0deg | | 1064nm THG-> 355nm | 4x4x7mm | Type II, Theta=38.6deg, Phi=30deg | | 1064nm 4HG-> 266nm | 4x4x7mm | Type I, Theta=47.6deg, Phi=0deg | | 1064nm 5HG-> 213nm | 4x4x7mm | Type I, Theta=51.1deg, Phi=0deg | | | | OPO and OPA pumped by harmonics of Nd:YAG lasers | | 532nm Pump-> 680-2600nm | 4x4x12mm | Type I, Theta=21deg, Phi=0deg | | 355nm Pump-> 410-2600nm | 6x4x12mm | Type I, Theta=30deg, Phi=0deg | | 355nm Pump-> 410-2600nm | 7x4x15mm | Type II, Theta=37deg, Phi=30deg | | 266nm Pump-> 295-2600nm | 6x4x12mm | Type I, Theta=39deg, Phi=0deg | | | | Frequency doubling of dye lasers | | 670-530nm SHG-> 355-260nm | 8x4x7mm | Type I, Theta=40deg, Phi=0deg | | 600-440nm SHG-> 300-220nm | 8x4x7mm | Type I, Theta=55deg, Phi=0deg | | 444-410nm SHG-> 222-205nm | 8x4x7mm | Type I, Theta=80deg, Phi=0deg | | | | Harmonic generations of Ti:Sapphire lasers | | 700-1000nm SHG-> 350-500nm | 7x4x7mm | Type I, Theta=28deg, Phi=0deg | | 700-1000nm THG->240-330nm | 8x4x7mm | Type I, Theta=42deg, Phi=0deg | | 700-1000nm FHG-> 210-240nm | 8x4x7mm | Type I, Theta=66deg, Phi=0deg | | | | Frequency doubling and tripling of Alexandrite lasers | | 720-800nm SHG-> 360-400nm | 4x4x7mm | Type I, Theta=31deg, Phi=0deg | | 720-800nm THG-> 240-265nm | 4x4x7mm | Type I, Theta=48deg, Phi=0deg | | | | Intracavity SHG of Ar+ laser with Brewster angle cut BBO | | 514nm SHG-> 257nm | 4x4x7mm | Type I, Theta=51deg, Phi=0deg | | 488nm SHG-> 244nm | 4x4x7mm | Type I, Theta=55deg, Phi=0deg |
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