Bismuth Silicate & Bismuth Germanate ( BSO & BGO )
Structural and Physical Properties | ![]() |
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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 |
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Thermal Conductivity | ^c, 1.2 W/m/K; //c, 1.6 W/m/K |
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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) |
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 |
?-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 |