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CLBO - Cesium Lithium Borate
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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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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.

Keyword:
UV Nonlinear crystal
CLBO
Cesium lithium borate
fourth fifth harmonic generation
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CLBO - Cesium Lithium Borate
CLBO
  • 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 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.

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