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1.8.2 Acoustooptic Materials
A figure of merit for an acoustooptic material is M = n6p2/ρv3, where n is the refractive index, p is the photoelastic constant, ρ is the density, and ν is the sound velocity.
Properties of Selected Acoustooptic Materials
|
Transparency |
Acoustic |
Acoustic |
Figure |
|
range |
mode/ |
velocity |
of |
Material |
( m) |
direction |
((km/s) |
merit |
Ge |
2–20 |
L <111> |
5.5 |
840 |
Hg2Br2 |
0.40–30 |
S <110> |
0.273 |
2600 |
Hg2Cl2 |
0.36–20 |
S <110> |
0.347 |
700 |
Hg2I2 |
0.45–40 |
S <110> |
0.254 |
3200 |
LiNbO3 |
0.35–5.0 |
L <100> |
6.5 |
4.6 |
PbBr2 |
0.36–60 |
S <010> |
2.30 |
550 |
PbCl2 |
0.35–20 |
S <001> |
2.51 |
136 |
PbMoO4 |
0.42–5.5 |
L <001> |
3.63 |
36.3 |
SiO2 |
0.12–4.5 |
L <100> |
5.72 |
2.38 |
TeO2 |
0.35–5.0 |
L <001> |
4.2 |
34.5 |
|
|
S <110> |
0.62 |
793 |
Tl3AsS3 |
1.3–17 |
L <001> |
2.15 |
416 |
All measurements at 0.633 m, except for Ge at 10.6 m; L = longitudinal, S = shear.
Reference:
Gottlieb, M. and Singh, N. B., Elastooptic materials, Handbook of Laser Science and Technology, Suppl. 2: Optical Materials (CRC Press, Boca Raton, FL, 1995), p. 416.
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