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.
|Transparency range, µm||0.4 - 5|
|Lattice parameters (hexagonal), Å||a = 5.154, c = 13.784|
|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|