Nonlinear optical crystal LB4 (Li2B4O7)
LiB4O7
(lithium tetraborate)
Main Properties
| Transparency range, µm | 0.16 – 3.5 | |
| Nonlinear coefficient, pm/V | d31 = 2.0; d31 = 0.12 | |
| Symmetry | Tetragonal, 4mm point group | |
| Cell parameters, Å | a=12.818, b=6.404, c=10.596 | |
| Typical Reflection index |
1064 nm 532 nm |
no=1.5980, ne=1.5432 no=1.6139, ne=0.5564 |
| Optical Damage Threshold, GW/cm2 |
1064 nm (t=10 ns) |
1 |
| Walk off angle, ° (532 nm) | 1.9 | |
| Mohs hardness | 4-5 | |
| Chemical properties | Non-hygroscopic | |
The parameters of optical elements
| Orientation accuracy, arc min | < 30 | |
| Parallelism, arc sec | < 30 | |
| Flatness | 546 nm | λ/6 |
| Surface quality, scratch/dig | 20/10 | |
Application
- Substrate for a surface acoustic wave (SAW) devices
- Harmonics generation (SHG, THG, 4HG, 5HG) of YAG lasers
- High power ultraviolet light source based on SHG and SFG of the visible radiation.