Cut-off wavelength up to 180nm.
Relatively large effective SHG coefficient (about two times that of KDP).
The VUV output at 193 nm is available by phase matching.
Maximum FOHG and FIHG conversion efficiencies of Nd doped laser.
Wide acceptance angle and small walk-off angle.
No saturation for high-power generation.
Short growth cycle and large size under the Lower Viscosity Growth Technology.
Noncritically phase-matched second-harmonic generation in cesium lithium borate
Cesium Lithium Borate CsLiB6O10 (CLBO) is a nonlinear crystal perfect for harmonic generation in the UV range with a transmission cut-off edge reaching 180 nm. Compared with common BBO nonlinear optical material, CLBO crystals feature larger spectral and temperature acceptance, better angle tolerance, and a smaller walk-off angle. CLBO Crystal is a good choice for Second-harmonic generation (SHG), and it is suitable for frequency quadrupling (FHG) of high-power Nd:YAG laser systems. CLBO shows no saturation for high-power generation due to the absence of two-photon absorption typically observed in BBO and KDP crystals.
Nonlinear Optical Properties of CLBO and BBO Crystal
| CLBO Crystal | BBO Crystal |
| 532.0(o)+ 532.0(o)= 266.0(e) | 532.0(o)+ 532.0(o)= 266.0(e) |
| Walkoff [mrad] = 0.00 0.00 32.96 | Walkoff [mrad] = 0.00 0.00 85.30 |
| Phase velocities = c/ 1.498 1.498 1.498 | Phase velocities = c/ 1.674 1.674 1.674 |
| Group velocities = c/ 1.527 1.527 1.626 | Group velocities = c/ 1.722 1.722 1.894 |
| GrpDelDisp(fs^2/mm) = 77.7 77.7 232.2 | GrpDelDisp(fs^2/mm) = 136.0 136.0 429.3 |
| At theta = 61.5 deg. | At theta = 47.7 deg. |
| deff = 7.88E-1 pm/V | deff = 1.75E0 pm/V |
| S_o x L^2 = 5.16E7 Watt | S_o x L^2 = 1.45E7 Watt |
| Crystal ang. tol. = 0.54 mrad°m | Crystal ang. tol. = 0.19 mrad°m |
| Temperature range = 6.80 K°m | Temperature range = 6.02 K°m |
| Mix accpt ang = 1.08 1.08 mrad°m | Mix accpt ang = 0.37 0.37 mrad°m |
| Mix accpt bw = 10.14 10.14 cm-1°m | Mix accpt bw = 5.80 5.80 cm-1°m |
Chemical and Structural Properties of CLBO Crystal
| Crystal Structure | Tetragonal, Space group Ⅰ |
| Lattice Parameter | a = b = 10.494 Å, c = 8.939 Å |
| Symmetry | Z = 4 |
| Melting Point | About 844.5 ℃ |
Optical and Nonlinear Optical Properties of CLBO Crystal
Transparency Range | 180-2750 nm |
Angle Acceptance | 1.02 mrad·cm at 1064nm |
| 0.49 mrad·cm at 532nm | |
| 0.84 mrad·cm at 488nm | |
Temperature Acceptance | 9.4℃·cm |
Spectral Acceptance | 7.03 nm·cm at 1064 nm |
| 0.13 nm·cm at 532 nm | |
| 0.09 nm·cm at 488 nm | |
| Walk-off Angle | 1.78 °at 1064 nm |
| 1.83 °at 532 nm | |
| 0.98 °at 488 nm | |
| NLO Coefficients | 1.01 pm/V at 532 nm |
| 1.16 pm/V at 488 nm | |
| 0.95 pm/V at 1064 nm | |
| NLO Coefficients | deff (Ⅰ) = d36 sinθm sin(2Ф) |
| deff (Ⅱ) = d36 sin(2θm) sin(2Ф) | |
Sellmeier Equation (λ in μm) | CLBO at 20 ℃ |
no2=2.2104+0.01018/(λ2-0.01424) -0.01258λ2 | |
ne2=2.0588+0.00838/(λ2 -0.01363) -0.00607λ2 | |
| (0.1914 µm<λ<2.09 µm) |
| Dimension Tolerance | +0/-0.1mm |
| Thickness Tolerance | ±0.15mm |
| Clear Aperture | ＞90% |
| Flatness | ＜ λ/6 @633 nm |
| Surface Quality | 10/5 to MIL-PRF-13830B |
| Parallelism | ＜20 arc sec |
| Perpendicularity | ＜ 15 arc min |
| Angle Tolerance | Δθ ＜ 0.25 °, ΔФ ＜ 0.25 ° |
| Chamfer | ＜0.2 mm × 45 ° |
| Chip | ＜0.1mm |
| Damage Threshold 10ns, 10 Hz (AR-Coated) | ＞ 300MW/cm2 @532nm |
| ＞ 150 MW/cm2 @266nm | |
| Quality Warranty Period | One year under proper use |
