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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.

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NLO Crystals

Crystals

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Description

Parameters

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 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	61.70	0.84	0.49	1.83	0.13	8.30
532 + 532 = 266	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
1064 + 266 = 213	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	d_eff (Ⅰ) = d₃₆ sinθ_msin(2 Ф) d_eff(Ⅱ) = d₃₆ sin(2θm) sin(2 Ф)
Sellmeier Equations (λ in μm)	CLBO at 20 ℃ n_o² = 2.2104 + 0.01018 / (λ² - 0.01424) - 0.01258 λ² n_e² = 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.

Keyword:

UV Nonlinear crystal

CLBO

Cesium lithium borate

fourth fifth harmonic generation

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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.

Description

Cas'Tech Class

Parameters

Download

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	61.70	0.84	0.49	1.83	0.13	8.30
532 + 532 = 266	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
1064 + 266 = 213	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	d_eff (Ⅰ) = d₃₆ sinθ_msin(2 Ф) d_eff(Ⅱ) = d₃₆ sin(2θm) sin(2 Ф)
Sellmeier Equations (λ in μm)	CLBO at 20 ℃ n_o² = 2.2104 + 0.01018 / (λ² - 0.01424) - 0.01258 λ² n_e² = 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