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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	61.7	0.84	0.49	1.83	0.13	8.3
532 + 532 = 266	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
1064 + 266 = 213	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	d_eff(Ⅰ) = d₃₆ sinθ_m sin(2Ф) d_eff (Ⅱ) = d₃₆sin(2θ_m) sin(2Ф)


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/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.

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	61.7	0.84	0.49	1.83	0.13	8.3
532 + 532 = 266	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
1064 + 266 = 213	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	d_eff(Ⅰ) = d₃₆ sinθ_m sin(2Ф) d_eff (Ⅱ) = d₃₆sin(2θ_m) sin(2Ф)


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/266 nm/213 nm	R < 1% @1064 nm R < 3% @266 nm R < 3% @213 nm