Bismuth Silicate & Bismuth Germanate ( BSO & BGO )

Structural and Physical Properties   Barium
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 δddn ≈ 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 γ??11 = 2.7 pm/V, γ??22, γ??31 <0.1 γ??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)
 
List of Optical Crystals       
Materials Refractive Index Transmission
Range (mm)
Density
(g/cm³)
Thermal Expansion
Coefficient (10-6/K)
BK7 glass 1.5164 (588 nm) 0.330 – 2.1 2.51 7.5
SF11 glass 1.78472 (588 nm) 0.370 – 2.5 4.74 6.8
F2 glass 1.62004 (588 nm) 0.420 – 2.0 3.61 8.2
Fused Silica 1.4858 (308 nm) 0.185 – 2.5 2.20 0.55
CaF2 1.399  (5.0 mm) 0.170 – 7.8 3.18 18.85
BaF2  1.460 (3.0 um) 0.15 – 12.0 4.88 18.4
Sapphire 1.755 (1.0mm) 0.180 – 4.5 3.98 8.4
Silicon 3.4179 (10mm) 1.200 – 7.0 2.33 4.15
Ge 4.003 (10 mm) 1.900 – 16 5.33 6.1
ZnSe 2.40  (10 mm) 0.630 – 18 5.27 7.8
ZnS 2.2 (10mm) 0.380 –14 4.09 6.5
LiF 1.39 (500 nm) 0.150 – 5.2 2.64 37
KBr 1.526 (10 mm) 0.280 – 22 2.75 43
 MgF2 no =  1.3836  ne = 1.3957 (405 nm) 0.130 – 7.0 7.37 a: 13.7
b: 8.48
YVO4 no = 1.9500  ne = 2.1554 (1.3 mm) 0.400 – 5.0 4.22 a: 4.46
b: 11.37
Calcite no =  1.6557  ne = 1.4852 (633 nm) 0.210 – 2.3 2.75 a: 24.39
b: 5.68
Quartz no =  1.5427  ne = 1.5518 (633 nm) 0.200 – 2.3 2.65 7.07
α-BBO no =  1.6749  ne = 1.5555 (532 nm) 0.190 – 3.5 3.85 a: 4.0
c: 36
LiNbO3 no =  2.2863 ne = 2.2027 (633 nm) 0.370 – 4.5 4.64 a: 16.7
c: 2.0