Lithium Tri-borate (LBO) is one of the most useful nonlinear optical material not just for its relatively large conversion coefficient - 3x that of KDP, but also for its excellent physical properties...
|
Chemical Formula
|
LiB3O5
|
|
Crystal Structure
|
Orthorhombic, mm2
|
|
Cell Parameters
|
a = 8.4473, b = 7.3788Å, c = 5.1395Å, Z = 2
|
|
Melting point
|
834°C
|
|
Optical homogeneity
|
d n ~ 10-6/cm
|
|
Mohs hardness
|
6
|
|
Density
|
2.47 g/cm3
|
|
Absorption coefficient
|
< 0.1%/cm (at 1064nm and 532nm)
|
|
Specific heat
|
1.91J/cm3xK
|
|
Hygroscopic susceptibility
|
low
|
|
Thermal expansion coefficients
|
a, 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
|
160-2600nm
|
|
Refractive indices:
at 1064nm
at 532nm at 355nm |
nx = 1.5656, ny = 1.5905, nz = 1.6055 (at 1064nm)
ne = 1.5785, no = 1.6065, nz = 1.6212
ne = 1.5971, no = 1.6275, nz = 1.6430 |
|
Therm-optic coefficients
|
dno/dT = -9.3 x 10-6/°C
dne/dT = -16.6 x 10-6/°C |
|
Sellmeier Equations (l in mm)
|
no2 (l) = 2.7359 - 0.01354l2+ 0.01878/(l2-0.01822)
ne2(l) = 2.3753 - 0.01516l2+ 0.01224/(l2-0.01667) |
|
Phase-matchable output wavelength
|
554 - 2660nm (type I), 790 – 2150nm (type II)
|
|
NLO coefficients
|
d33 = 0.06; d32 = 1.2; d22 = 1.1
|
|
Walk-off Angles(@ 1064nm)
|
0.4° (Type I SHG), 0.3° (Type II SHG)
|
|
Acceptance Angles(@1064nm) for SHG Type I
|
9.6(mrad-cm) CPM at 25°C 248(mrad-cm) NCPM at 150°C
|
|
Electro-optic coefficients
|
g 11 = 2.7 pm/V, g 22, g31 < 0.1g11
|
|
Conversion Efficiency
|
>90% (1064 -> 532nm) Type I SHG
|
|
Damage threshold
|
45 GW/cm2(1 ns)@1064nm
|
|
Specification
|
Standard
|
High Precision
|
|
Dimensions
|
Size: Up to 30x30mm2
Thickness: 0.1mm to 60mm
|
|
|
Dimension Tolerance
|
+/-0.1mm
|
+/-0.01mm
|
|
Wavefront Distortion
|
λ/8
|
λ/8
|
|
Flatness
|
λ/10
|
λ/10
|
|
Surface Quality
|
10/5
|
10/5
|
|
Parallelism
|
20’’
|
10’’
|
|
Specificationg
|
|
|
Reflection
|
R<0.2%@1064nm, R<0.5%@532nm
|
|
Damage Threshold
|
>500MW/cm2
|