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β-BBO Crystal

         
  Applications: Second, third, fourth and fifth harmonic generation of Nd:YAG and Nd:YLF laser  
    Frequency-doubling, -tripling and -mixing of Dye lasers  
    Second, third and fourth harmonic generation of Ti:Sapphire and Alexandrite lasers  
    Optical parametric amplifier (OPA) and optical parametric oscillators (OPO)  
    Frequency-doubling of Argon ion, Cu-vapor and Ruby lasers  
    Research and development for advanced laser techniques, including all-solid state wide-tunable lasers, ultrafast pulse lasers, and DUV lasers.  
         
  Features: Broad phase-matching range from 409.6 nm to 3500nm  
    Wide transmission range from 190 nm to 3500nm  
    Large effective second-harmonic-generation (SHG) coefficient about 6 times greater than that of KDP crystal  
    High damage threshold of 10GW/cm2 for 100ps pulse-width at 1064nm  
    High optical homogeneity with δn10-6/cm  
    Wide temperature-bandwidth of about 55°C  
         
         
  Main Specification Material β-BaB2O4  
  Length/Thickness 0.01 ~ 25mm  
  Phase matching angle θ and φ Determined by different kinds of harmonic generation.  
  Phase matching type Type I or Type II  
  Coating P-coatings, AR-coatings and mounts  
  Angle tolerance Δθ< ± 0.5°; Δφ< ±0.5°  
  Dimension tolerance (W ± 0.1mm) × (H ± 0.1mm) × (L + 0.2mm/-0.1mm)  
  Flatness λ/8 @ 633nm  
  Surface quality 10/5 scratch/dig per MIL-O-13830A  
  Parallelism <20 arc sec  
  Perpendicularity 5 arc min  
  Wavefront distortion < λ/8 @ 633nm  
  Clear aperture > 90% central area  
  Physical Properties Crystal Structure Trigonal, space group R3c  
Cell Parameters a = b = 12.532Ä, c = 12.717Ä, Z = 6  
Melting Point 1095 ± 5°C  
Transition Temperature 925 ± -5°C  
Optical Homogeneity d10-6/cm  
Hardness 4.5 Mohs   
Density 3.85 g/cm3  
Specific heat 490 J/kg/°C  
Absorption Coefficient < 0.1%/cm (at 1064 nm)  
Hygroscopic Susceptibility Low  
Resistivity > 1011 ohm-cm  
Relative Dielectric Constant eT11/e0: 6.7, eT33/e0: 8.1  
Tan d, < 0.001
Thermal Expansion Coefficients a, 4 x 10-6/K  
(in the range of 25°C- 900°C) c, 36 x 10-6/K
Thermal Conductivity ^c, 1.2 W/m/K; ||c, 1.6 W/m/K  
Thermal conductivity coefficients    
  Linear Optical Properties Transparency Range 189 - 3500 nm  
  Refractive Indices ne = 1.5425, no = 1.6551 @ 1064 nm  
ne = 1.5555, no = 1.6749 @ 532 nm
ne = 1.6146, no = 1.7571 @ 266 nm
  Therm-Optic Coefficients dno/dT = - 9.3 x 10-6/°C  
dne/dT = -16.6 x 10-6/°C
  Sellmeier Equations:/(λ in μm) no2(l) = 2.7359+0.01878/(l2-0.01822)-0.01354 l2  
ne2(l) = 2.3753+0.01224/(l2-0.01667)-0.01516 l2
Nonlinear Optical Properties Phase-matchable SHG range 189 - 1750nm  
NLO coefficients d11 = 5.8 x d36(KDP)  
d31 = 0.05 x d11
d22< 0.05 x d11
Electro-Optic Coefficients a1 = 11 x 10-6 °C-1  
a2 = 9 x 10-6 °C-1
a3 = 0.6 x 10-6 °C-1
Half-Wave Voltage 48 KV (at 1064 nm)  
Damage Threshold 5 GW/cm2 (10 ns) @1064nm  
10 GW/cm2 (1.3 ns) @ 1064 nm
1 GW/cm2 (10 ns) @532 nm
7 GW/cm2 (250 ps) @ 532 nm
       
  Notice BBO is hygroscopic. In application, protective coating or AR coating or crystal housing is usually recommended.   
 
    Engineers can select and design the best solution for you, if the main parameters of your laser are provided, such as energy per pulse, pulse width and repetition rate for a pulsed laser, power for a cw laser, laser beam diameter, mode condition, divergence, wavelength tuning range, etc.