LGS Substrate
Description
LGS can be used to make piezoelectric and electro-optical devices. It has high temperature piezoelectric properties. The electromechanical coupling coefficient is three times of that of quartz, and the phase transition temperature is high (from room temperature to melting point 1470 ℃). It can be used in saw, BAW, high temperature sensor and high power, high repetition rate electro-optic Q-switch.
Properties
| Material |
LGS （La3Ga5SiO14） |
| Hardness (Mho) |
6.6 |
| Growth |
CZ |
| System |
Rigonal system, group 33 a=8.1783 C=5.1014 |
| Coefficient of thermal expansion |
a11:5.10 a 33:3.61 |
| Density（g/cm3） |
5.754 |
| Melting Point(°C) |
1470 |
| Acoustic Velocity |
2400m/Sec |
| Frequency Constant |
1380 |
| Piezoelectric Coupling |
K2 BAW: 2.21 SAW:0.3 |
| Dielectric Constant |
18.27/ 52.26 |
| Piezoelectric Strain Constant |
D11=6.3 D14=5.4 |
| Inclusion |
No |
LGS Substrate Definition
LGS (Lithium Gallium Silicate) substrate refers to a specific type of substrate material commonly used for the growth of single crystal thin films. LGS substrates are mainly used in the fields of electro-optic and acousto-optic devices, such as frequency converters, optical modulators, surface acoustic wave devices, etc.
LGS substrates consist of lithium, gallium, and silicate ions with specific crystal structures. This unique composition gives LGS substrates ideal optical and physical properties for a variety of applications. These substrates exhibit relatively high refractive indices, low light absorption, and excellent transparency in the visible to near-infrared wavelength range.
LGS substrates are particularly suitable for the growth of thin film structures as they are compatible with various deposition techniques such as molecular beam epitaxy (MBE) or epitaxial growth methods such as chemical vapor deposition (CVD).
Specific properties of LGS substrates, such as piezoelectric and electro-optic properties, make them ideal for manufacturing devices that require voltage-controlled optical properties or generate surface acoustic waves.
In summary, LGS substrates are a specific type of substrate material used to grow single-crystal thin films for applications in electro-optic and acousto-optic devices. These substrates have desirable optical and physical properties that make them suitable for a variety of optical and electronic applications.
