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![[ Castech ]<Br>CLBO - Cesium Lithium Borate<br>Nonlinear Crystal](/thum_img/mjct/goods_img3/2b972673bfcd219a52415cf8afb980ff_water_4de0b559c44a49f5f544fca08f3bc282_c0_w500_h500.jpg)
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Introduction
Cesium Lithium Borate (CsLiB6O10 or CLBO) is a newly developed crystal with excellent UV nonlinear feature, and widely used for semiconductor inspection, micro processing, bio-medical, UV-LiDAR, etc. Compared to BBO, it has larger spectral and temperature acceptance, larger angle tolerance and smaller walk-off angle (see Table 1). These advantages make CLBO obtain larger SHG conversion efficiency than BBO. Moreover, it is suitable for FOHG and FIHG of high-power Nd:YAG laser.
CASTECH'S CLBO is featured by
- Cut-off wavelength up to 180 nm;
- Maximum FOHG and FIHG conversion efficiencies of Nd doped laser;
- Relatively large effective NLO coefficient (about two times that of KDP);
- Wide acceptance angle and small walk-off angle;
- The VUV output at 193 nm is available by phase matching;
- No saturation for high-power generation;
- Short grow cycle and large size.
CASTECH offers
- Strict quality control;
- Cutting angle and dimension upon request;
- Sealed-housing or AR-coating/P-coating to prevent deliquescence;
- AR-coating for fourth or fifth harmonic generations of 1064 nm;
- Reworking services;
- Fast delivery (15 working days for polished only, 20 working days for AR-coated).
Basic Properties
Table 1. Nonlinear Optical Properties of CLBO and BBO Crystal
|
Wavelength (nm) |
NLO Crystal |
Phase Matching Angle (deg) |
Deff (pm/V) |
Angle Tolerance (mrad·cm) |
Walk-off Angle (deg) |
Spectral Acceptance (nm·cm) |
Temperature Acceptance (℃·cm) |
| 532 + 532 = 266 | CLBO | 61.7 | 0.84 | 0.49 | 1.83 | 0.13 | 8.3 |
| BBO | 47.7 | 1.32 | 0.17 | 4.8 | 0.07 | 4.5 | |
| 1064 + 266 = 213 | CLBO | 68.4 | 0.87 | 0.42 | 1.69 | 0.16 | 4.6 |
| BBO | 51.1 | 1.26 | 0.11 | 5.34 | 0.08 | 3.1 |
Table 2. Chemical and Structural Properties
| 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 ℃ |
Table 3. Optical and Nonlinear Optical Properties
| Transparency Range | 180-2750 nm |
| Angle Acceptance | 1.02 mrad·cm at 1064 nm, 0.49 mrad·cm at 532 nm，0.84 mrad·cm at 488 nm. |
| 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 |
| Effective 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 Equations(λ in μm) |
CLBO at 20 ℃ no2 = 2.2104 + 0.01018 / (λ2 - 0.01424) - 0.01258 λ2 ne2 = 2.0588 + 0.00838 / (λ2 - 0.01363) - 0.00607 λ2 (0.1914 µm<λ<2.09 µm) |
CLBO's Parameters
Table 4. Specifications
| Dimension Tolerance |
(W ± 0.1 mm) × (H ± 0.1 mm) × (L + 0.5/-0.1 mm) (L≧2.5 mm) (W ± 0.1 mm) × (H ± 0. 1 mm ) × (L + 0.1/-0.1 mm) (L＜2.5 mm) |
| Clear Aperture | Central 90% of the diameter |
| Surface Quality (Scratch/Dig) | 10/5 to MIL-PRF-13830B |
| Flatness | ≦ λ/6 @633 nm |
| Parallelism | 20 arc sec |
| Perpendicularity | ≦ 15 arc min |
| Angle Tolerance | Δθ ≦ 0.25 °, ΔФ ≦ 0.25 ° |
| Chamfer | ≦ 0.2 mm × 45 ° |
| Chip | ≦ 0.1 mm |
| Damage Threshold [] |
＞ 300 MW/cm2 @532 nm, 10 ns, 10 Hz (AR-Coated); ＞ 150 MW/cm2 @266 nm, 10 ns, 10 Hz (AR-Coated); |
| Quality Warranty Period | One year under proper use. |
Coatings
- Dual or triple band AR-coating of CLBO for fourth and fifth harmonic generation of 1064 nm;
- High damage threshold;
- Long durability;
- Other coatings are available upon request.
Table 5. Reflectance of AR-coating
| Base Material | AR-Coating | Reflectance |
| CLBO | AR-532 nm/266 nm |
R < 0.2% @532 nm R < 1% @266 nm |
| CLBO | AR-1064 nm/266 nm/213 nm |
R < 1% @1064 nm R < 3% @266 nm R < 3% @213 nm |
Notes
CLBO crystal is very hygroscopic, and please use or keep it in dry and sealed environment.
