Single Crystal Substrates: LTA
Single Crystal Substrates: LTA
Description
LTA, or lithium tantalate (LiTaO3), is a single crystal substrate that is commonly used in electronics and photonics applications. It is a ferroelectric material with a perovskite structure and a high Curie temperature, which makes it suitable for use in high-temperature applications.
LTA has a trigonal crystal structure with lattice parameters of a = 5.154 Å and c = 13.776 Å. It has a high electro-optic coefficient, which makes it useful in the design of electro-optic modulators, optical switches, and frequency doublers. LTA is also used in surface acoustic wave (SAW) devices, as it has a high acoustic velocity and a low acoustic loss.
LTA is transparent in the visible to mid-infrared range and can be grown as bulk crystals or thin films using various techniques such as Czochralski method, Bridgman method, and sol-gel process.
| Material | LTA |
| Transparency range, µm | 0.4 - 5 |
| Point group | 3m |
| Space group | R3c |
| Lattice parameters (hexagonal), Å | a = 5.154, c = 13.784 |
| Density, g/cm3 | 7.45 |
| Mohs hardness | 5.5 |
| Refractive indexes : | no = 2.183, ne = 2.188 (at 0.6 µm) |
| no = 2.131, ne = 2.134 (at 1.2 µm) | |
| Non-linear coefficient at 1.06 µm, pm/V | d22 = 2, d31 = -1, d33 = -21 |
| Electroptical coefficient at 0.63 µm, pm/V | r13 = 8, r22 = -0.2, r33 = 30 |
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