The Lithium Triborate (LiB3O5 or LBO) is an excellent nonlinear optical crystal
With followings:
Broad transparency range from 160nm to 2.6um,
High optical homogeneity (dn»10-6/cm) and being free of inclusion;
Relatively 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.
1. Chemical and Structural properties
|
Crystal Structure |
Orthorhombic, Space group Pna21, Point group mm2 |
|
Lattice Parameter |
a=8.4473Å, b=7.3788Å , c=5.1395Å , Z=2 |
|
Melting Point |
About 834¡æ |
|
Mohs Hardness |
6 |
|
Density |
2.47 g/cm3 |
|
Thermal Conductivity |
3.5W/m/K |
|
Thermal Expansion Coefficient |
ax=10.8x10-5/K, ay= -8.8x10-5/K, az=3.4x10-5/K |
2. Optical and Nonlinear Optical Properties
|
Transparency Range |
160-2600nm |
|
SHG Phase Matchable Range |
551 ~ 2600nm (Type I) 790-2150nm (Type II) |
|
Therm-optic Coefficient
(¡ãC, ¦Ë in ¦Ìm) |
dnx/dT=-9.3X10-6
dny/dT=-13.6X10-6
dnz/dT=(-6.3-2.1¦Ë)X10-6 |
|
Absorption Coefficient |
<0.1%/cm at 1064nm <0.3%/cm at 532nm |
|
Angle Acceptance |
6.54mrad-cm (¦Õ, Type I,1064 SHG)
15.27mrad-cm (q, Type II,1064 SHG) |
|
Temperature Acceptance |
4.7¡ãC-cm (Type I, 1064 SHG)
7.5¡ãC-cm (Type II,1064 SHG) |
|
Spectral Acceptance |
1.0nm-cm (Type I, 1064 SHG)
1.3nm-cm (Type II,1064 SHG) |
|
Walk-off Angle |
0.60¡ã (Type I 1064 SHG)
0.12¡ã (Type II 1064 SHG) |
|
NLO Coefficients |
deff(I)=d32cos¦µ (Type I in XY plane)
deff(I)=d31cos2¦È+d32sin2¦È (Type I in XZ plane)
deff(II)=d31cos¦È (Type II in YZ plane)
deff(II)=d31cos2¦È+d32sin2¦È (Type II in XZ plane) |
|
Non-vanished NLO susceptibilities |
d31=1.05 ¡À 0.09 pm/V
d32= -0.98 ¡À 0.09 pm/V
d33=0.05 ¡À 0.006 pm/V |
|
Sellmeier Equations(¦Ë in ¦Ìm) |
nx2=2.454140+0.011249/(¦Ë2-0.011350)-0.014591¦Ë2-6.60x10-5¦Ë4
ny2=2.539070+0.012711/(¦Ë2-0.012523)-0.018540¦Ë2+2.0x10-4¦Ë4
nz2=2.586179+0.013099/(¦Ë2-0.011893)-0.017968¦Ë2-2.26x10-4¦Ë4 |
3. HZL should provide the LBO with high quality and
Standard size: 4x4x12, 3x3x15,3x3x20mm3 etc., AR-coating, mounted and repair services; |
