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CLBO - Cesium Lithium Borate
Introduction
Cesium Lithium Borate (CsLiB6O10 or CLBO) is a newly developed crystal with excellent UV nonlinear feature, and widely used for high-power lasers, microprocessding, optical communications, optical imaging, 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 |
61.70 |
0.84 |
0.49 |
1.83 |
0.13 |
8.30 |
BBO |
47.70 |
1.32 |
0.17 |
4.80 |
0.07 |
4.50 |
|
1064 + 266 = 213 |
CLBO |
68.40 |
0.87 |
0.42 |
1.69 |
0.16 |
4.60 |
BBO |
51.10 |
1.26 |
0.11 |
5.34 |
0.08 |
3.10 |
Table 2. Chemical and Structural Properties |
|
Crystal Structure |
Tetragonal, Space group Ⅰ 42m |
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 sinθmsin(2 Ф) deff (Ⅱ) = d36 sin(2θm) sin(2 Ф) |
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/532 nm/266 nm |
R<1.5% @ 1064 nm R<2% @ 532 nm R<2% @ 266 nm |
CLBO |
AR-1064 nm/266 nm/213 nm |
R<1.5% @ 1064 nm R<2% @ 266 nm R<2% @ 213 nm |
Notes
CLBO crystal is very hygroscopic, and please use or keep it in dry and sealed environment.
Products
-
CLBO - Cesium Lithium Borate
- CLBO, as one of the few UV nonlinear crystals with cutoff wavelength up to 180 nm, is used for FOHG and FHG of high-power Nd:YAG laser. CASTECH can offer UV AR-coating and sealed housing services.
-
Introduction
Cesium Lithium Borate (CsLiB6O10 or CLBO) is a newly developed crystal with excellent UV nonlinear feature, and widely used for high-power lasers, microprocessding, optical communications, optical imaging, 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 |
61.70 |
0.84 |
0.49 |
1.83 |
0.13 |
8.30 |
BBO |
47.70 |
1.32 |
0.17 |
4.80 |
0.07 |
4.50 |
|
1064 + 266 = 213 |
CLBO |
68.40 |
0.87 |
0.42 |
1.69 |
0.16 |
4.60 |
BBO |
51.10 |
1.26 |
0.11 |
5.34 |
0.08 |
3.10 |
Table 2. Chemical and Structural Properties |
|
Crystal Structure |
Tetragonal, Space group Ⅰ 42m |
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 sinθmsin(2 Ф) deff (Ⅱ) = d36 sin(2θm) sin(2 Ф) |
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/532 nm/266 nm |
R<1.5% @ 1064 nm R<2% @ 532 nm R<2% @ 266 nm |
CLBO |
AR-1064 nm/266 nm/213 nm |
R<1.5% @ 1064 nm R<2% @ 266 nm R<2% @ 213 nm |
Notes
CLBO crystal is very hygroscopic, and please use or keep it in dry and sealed environment.