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CLBO - Cesium Lithium Borate

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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.
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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 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
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
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

deff () = d36 sinθm sin(2Ф)    

deff () = d36 sin(2θm) sin(2Ф)    

Sellmeier Equations(λ in μm)

    CLBO at 20 

no= 2.2104 + 0.01018 / (λ2 - 0.01424) - 0.01258 λ2

ne2 = 2.0588 + 0.00838 / (λ- 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)  (L2.5 mm)

(W ± 0.1 mm) × (H ± 0. 1 mm ) × (L + 0.1/-0.1 mm)  (L2.5 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/cm@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.

  • NLO Crystals_Cesium Lithium Borate (CsLiB6O10 , CLBO).pdf

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    2020-11-19 10:56:13
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