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Beta-Barium Borate (β-BaB2O4) or (BBO)

Structural and Physical Properties      
Crystal Structure Trigonal, space group R3c    
Cell Parameters A = b = 12.532 Å    
  C = 12.717 Å    
  Z = 6    
Melting Point 1095 ± 5°C    
Transsition temperature 925 ± 5°C    
Optical homogeneity ?ddn ? 10-6 /cm    
Mohs Hardness 4    
Density 3.85 g/cm3    
Absorption Coefficient < 0.1 %/cm ( at 1064 nm )    
Specific hea: 1.91 J/cm3 x K    
Hygrocopic susceptibility Low    
Thermal expansion Coefficients. a, 4 x 10-6 /K
c, 36 x 10-6 /K
   
Thermal Conductivity ^c, 1.2 W/m/K;
//c, 1.6 W/m/K
   
Linear Optical Properties      
Transparency range 189 - 3500 nm    
Refractive indices at 1064 nm ne = 1.5425 no = 1.6551
at 532 nm ne = 1.5555 no = 1.6749  
at 266 nm ne = 1.6146 no = 1.7571  
Therm - optic Coefficients. dno / dt = -9.3 x 10-6 /°C    
  dne / dt = -16.6 x 10-6 /°C    
Nonlinear Optical Properties      
Phase - matchable output Wavelenghts 189 - 1750 nm    
NLO Coefficients d11 = 5.8 x d36 (KDP)    
  d31 = 0.05 x d11    
  d22 = 0.05 x d11    
Electro - Optic Coefficients ???11 = 2.7 pm/V, ???22, ???31 <0.1 ???11    
Half - wave voltage 48 KV (at 1064 nm)    
Damage threshold at 1064 nm 5 GW / cm2
(10 ns)
10 GW / cm2
(1.3 ns)
at 532 nm 1 GW / cm2
(10 ns)
7 GW / cm2
(250 ns)
 

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