Home > NLO crystals > BB0 > BBO crystal
BBO crystal
◇Broad phase matchable range from 409.6 nm to 3500 nm;
◇Wide transmission region from 190 nm to 3500 nm;
◇Large effective second-harmonic-generation (SHG) coefficient about 6 times
◇High damage threshold
◇High optical homogeneity with dn » 10-6/cm
◇Wide temperature-bandwidth of about 55°C
◇Nd: YAG and Nd: YLF laser for two, three, four or five harmonic generation
◇Dye laser's frequency, third harmonic generation and mixing
◇Ti:Sappire and Alexandrite for two, three, four or five octave
◇ Optical parametric amplifier (OPA) and optical parametric oscillator (OPO)
◇Argon ion, ruby and Cu vapor laser for harmonic generation
◇In all-solid-state tunable lasers, ultrafast pulse lasers, such as Deep Purple outside the laser, precision laser technology R & D
The main properties of BBO crystal
BBO is a negative uniaxial crystal, and its o-ray refractive index (no) than the e-ray (ne) refractive index, and can be calculated Selleimer equation (λ in μm):
no2=2.7359+0.01878 / (λ2-0.01822) -0.01354 λ2
ne2=2.3753+0.01224 / (λ2-0.01667) -0.01516 λ2
I, II phase matching category can be obtained by coordinate perspective。
BBO frequency-doubling crystal effective coefficient obtained by the following equation:
I:deff=d31sinθ+(d11cos3φ-d22sin3φ)cosθ
II:deff=(d11sin3φ+d22cos3φ)cos2θ
θ and φ polar coordinates, respectively, point to the z(=c) and x(=a)
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Crystal Structure:
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Trigonal, space group R3c
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Lattics Parameters:
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a=b=12.532Å, c=12.717Å, Z=7
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Melting point
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1095±5℃
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Phase transition point
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925±5℃
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Optical uniformity
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δn≈10-6/cm
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Mohs Hardness
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4
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Density
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3.85g/cm3
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Absorption coefficient
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<0.1%/cm(at 1064nm)
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Specific heat
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1.91J/cm3 xK
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deliquescence
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Low
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Thermal Conductivity
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⊥c,1.2W/m/K; //c, 1.6W/m/K
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Thermal Expansion Coefficients
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a11=4x10-6/K; a33=36x10-6/K
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Transparency Range:
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190-3500nm
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SHG Phase Matchable Range
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409.6-3500nm(Type I) 525-3500nm(Type II)
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therm-optic Coefficients(/℃)
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dno/dT=-16.6X10-6
dne/dT=-9.3X10-6
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Absorption Coefficients
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<0.1%/cm at 1064nm <1%/cm at 532nm
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Angle Acceptance
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0.8mrad-cm (θ, Type I,1064 SHG)
1.27mrad-cm (θ, Type II,1064 SHG) |
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Temperature Acceptance
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55℃-cm
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Spectral Acceptance
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1.1nm-cm
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Walk-off Angle
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2.7° (Type I 1064 SHG)
3.2° (Type II 1064 SHG) |
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NLO Coefficients
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deff (I)=d31sinθ+(d11cosΦ-d22sin3Φ)cosθ
deff (II)=(d11sin3Φ+d22cos3Φ)cos2θ |
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Non-vanished NLO susceptibilities
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d11=5.8xd36(KDP)
d31=0.05xd11 d22<0.05xd11 |
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sellmeier Equations(λ in μm )
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no2=2.7359+0.01878 / (λ2-0.01822) -0.01354 λ2
ne2=2.3753+0.01224 / (λ2-0.01667) -0.01516 λ2 |
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Electro-optic coefficients:
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r22=2.7pm/V
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Half-wave voltage:
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7KV (at 1064nm,3*3*20mm3)
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Resistivity:
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>1011 ohm-cm
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Relative Dielectric Constant:
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εs11/εo:6.7
εs33/εo:8.1 Tan δ<0.001 |
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Transmitting wavefront distortion
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less than λ/8 @ 633nm
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Dimension tolerance
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(W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm) (L≥2.5mm)
(W±0.1mm)x(H±0.1mm)x(L+0.1/-0.1mm) (L<2.5mm)
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Clear aperture
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central 90% or the diameter
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Flatness
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λ/8 @ 633nm
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Scratch/Dig code
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10/5 to MIL-PRF-13830B
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Parallelism
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≤20 arc seconds
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erpendicularity
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≤5 arc minutes
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Angle tolerance
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△θ≤±0.25°,△φ≤±0.25°
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Quality Warranty Period
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one year under proper use
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Notes
BBO has a low susceptibility to the moisture. The user is advised to provide dry conditions for both the use and preservation of BBO.
BBO is relatively soft and therefore requires precautions to protect its polished surfaces.
When angle adjusting is necessary, keep in mind that the acceptance angle of BBO is small.