LBO Crystal

LBO Crystal

LBO Crystal

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...

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LBO Crystal

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. 
LBO crystal has broad optical transparency range from 160 to 2600nm. It excels in high power SHG with minimal thermal lensing as compared to KTP. Its large acceptance angle paired with small walk-off angle which reduces the beam quality requirement for source lasers.
 

FEATURES:

Broad transparency range from 160nm to 2600nm
Large effective SHG coefficient (about three times that of KDP);
High damage threshold;
Wide acceptance angle and small walk-off;
Type I and type II non-critical phase matching (NCPM) in a wide wavelength range;
Spectral NCPM near 1300nm.
 

Crystal Structure

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
 

 Linear Optical Properties

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)

Nonlinear Optical Properties 

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
 

Capability:

1. Optical

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’’

2. Coating

Specificationg
Reflection
R<0.2%@1064nm, R<0.5%@532nm
Damage Threshold
>500MW/cm2