Lithium Triborate (LiB3O5
or LBO) is an excellent nonlinear crystal with wide transparency range, relative large effective nonlinear coefficient, high damage threshold and good chemical and mechanical properties. LBO allows temperature-controlled Non-Critical Phase-Matching (NCPM) for 1.0-1.3 ¦Ìm, Type I SHG, and also provides room temperature NCPM for Type II SHG at 0.8-1.1 ¦Ìm. It also possesses a relatively large angular acceptance bandwidth, reducing the beam quality requirements for pump lasers.
Physical and Chemical Properties:
| Crystal Structure |
Orthorhombic, Space group Pna21, Point group
mm2 |
| Lattice Parameters (Å) |
a=8.4473, b=7.3788, c=5.1395, Z=2 |
| Melting Point (¡ãC) |
~ 834 |
| Mohs Hardness |
~6 |
| Density (gram/cm3) |
~ 2.47 |
| Hygroscopic Susceptibility |
low |
| Thermal Conductivity (W/m/K) |
3.5
|
| Thermal Expansion Coefficient |
¦Áx=10.8x10-5/K, ¦Áy= -8.8x10-5/
K, ¦Áz=3.4x10-5/K
|
Optical and Nonlinear Properties:
| Transparency Range |
160 - 2600
nm |
| Phase Matching Range |
551-2600nm for Type
I, 790-2150nm for Type II |
| Thermo-Optic Coefficients (oC-1,
¦Ëin ¦Ìm) |
dnx/dT = - 9.3 x 10-6
dny/dT = -13.6 x 10-6
dnz/dT = (-6.3+2.1¦Ë) x 10-6 |
|
| Sellmeier Equations (¦Ë in ¦Ìm) |
| n2x= |
2.4542+0.01125/(¦Ë2-0.01135)-0.01388¦Ë2 |
| n2y= |
2.5390+0.01277/(¦Ë2-0.01189)-0.01848¦Ë2 |
| n2z= |
2.5865+0.01310/(¦Ë2-0.01223)-0.01861¦Ë2 |
|
| Non-Vanished Nonlinear 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 |
|
Main Applications:
- Optical parametric amplifiers (OPA) and oscillators (OPO);
- Frequency doubling (SHG) and tripling (THG) of Nd:YAG, Nd: YLF, Alexandtite, Cr:LiSAF, Ti:Sapphire,
Dye Lasers and Ultrashort Pulse Lasers.
OSICO Specifications:
| Apertures |
up to 20 x 20mm2 |
| Length |
up to 50mm |
| Dimension Tolerance |
(W ¡À 0.1mm) x (H ¡À 0.1mm) x (L + 0.2mm/-0.1mm) |
| Phase Matching Angle Tolerance |
∆¦È< ¡À 0.25¡ã; ∆¦Õ< ¡À0.25¡ã |
| Flatness |
¦Ë/8 @ 633nm |
| Wavefront Distortion |
¦Ë/8 @ 633nm |
| Surface Quality |
10/5 Scratch/Dig |
| Parallelism |
10 arc seconds |
| Perpendicularity |
5 arc minutes |
| Clear Aperture |
¡Ý90% central area |
|
