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CLBO - Cesium Lithium Borate
Keyword：
CLBO - Cesium Lithium Borate
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- Description
- Cas'Tech Class
- Parameters
-
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.
Key words:- UV Nonlinear crystal
- CLBO
- Cesium lithium borate
- fourth fifth harmonic generation
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