Crystal symmetry: 3m
Density: 7,454 g/cm^3
Optical spectral range: 0,4 - 5 mkm
Elastic constants 
: 10^11 dyn/cm^2 or 10^10 Pa)
| 23 | 4.07 | 7.84 | -1.11 | 0 | 0 |
| 4.07 | 23 | 7.84 | 1.11 | 0 | 0 |
| 7.84 | 7.84 | 27.5 | 0 | 0 | 0 |
| -1.11 | 1.11 | 0 | 9.56 | 0 | 0 |
| 0 | 0 | 0 | 0 | 9.56 | -1.11 |
| 0 | 0 | 0 | 0 | -1.11 | 9.46 |
Photolastic constants 
:
| -0.081 | 0.081 | 0.093 | -0.026 | 0 | 0 |
| 0.081 | -0.081 | 0.093 | 0.026 | 0 | 0 |
| 0.089 | 0.089 | -0.044 | 0 | 0 | 0 |
| 0.028 | -0.028 | 0 | 0.028 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0.028 | 0.028 |
| 0 | 0 | 0 | 0 | -0.026 | -0.081 |
Refraction indices:
The values for refraction coefficients for the given optical wavelengths:
| wavelength, mkm |  |  |
|---|
| 0.5 | 2.216 | 2.2205 |
|---|
| 0.6 | 2.1834 | 2.1878 |
|---|
| 0.7 | 2.1652 | 2.1696 |
|---|
| 0.8 | 2.1538 | 2.1578 |
|---|
| 0.9 | 2.1454 | 2.1493 |
|---|
| 1 | 2.1391 | 2.1432 |
|---|
| 1.2 | 2.1305 | 2.1341 |
|---|
| 1.4 | 2.1236 | 2.1273 |
|---|
| 1.6 | 2.1174 | 2.1213 |
|---|
| 1.8 | 2.112 | 2.117 |
|---|
| 2 | 2.1066 | 2.1115 |
|---|
| 2.2 | 2.1009 | 2.1053 |
|---|
| 2.4 | 2.0951 | 2.0993 |
|---|
| 2.6 | 2.0891 | 2.0936 |
|---|
| 2.8 | 2.0825 | 2.0871 |
|---|
| 3 | 2.0755 | 2.0299 |
|---|
| 3.2 | 2.068 | 2.0727 |
|---|
| 3.4 | 2.0601 | 2.0649 |
|---|
| 3.6 | 2.0513 | 2.0561 |
|---|
| 3.8 | 2.0424 | 2.0473 |
|---|
| 4 | 2.0335 | 2.0377 |
|---|
Sound velocity:
| direction | polarization | v (10^5 cm/s) |
|---|
| [100] | L | 5.55 |
| [100] | S | 4.21 |
| [100] | S | 3.37 |
| [010] | QL | 5.69 |
| [010] | QS | 3.88 |
| [010] | [100], S | 3.53 |
| [001] | L | 6.16 |
Lithium tantalate slowness surfaces in important planes
Acousto-optic figure of merit:
| sound dir. | sound pol. | light dir. | light pol. | M (10^-18 s^3/g) |
|---|
| [001] | L | -- | -- | 1.36 |
