LGS( Lanthanum gallium silicate )
LGS, also called lanthanum gallium silicate, has the chemical formula La₃Ga₅SiO₁₄ and is a nonlinear optical crystal with excellent electro-optic properties. LGS has a trigonal crystal structure, a relatively small thermal expansion coefficient, and weak thermal-expansion anisotropy. It has two independent electro-optic coefficients that remain stable over a broad temperature range. The crystal offers good mechanical properties, resistance to deliquescence, good physical and chemical stability, a high damage threshold, a high electro-optic coefficient, excellent electro-optic performance, a relatively small thermal expansion coefficient, and good high-temperature stability. It is widely used in electro-optic Q-switches, SAW and BAW devices, and high-power, high-repetition-rate all-solid-state lasers.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Direction | ±15′ |
| Wavefront distortion [@633nm] | <λ/8 @633nm |
| Extinction ratio | >500:1 |
| Diameter Tolerance | +0.00mm/-0.05mm |
| Length Tolerance | ±0.2mm |
| Chamfer [@45°] | <0.1mm @45° |
| Flatness [@633nm] | <λ/10 @633nm |
| Parallelism | <3 arcmin |
| Perpendicularity | <5 arcmin |
| Surface Quality | 10/5 |
| Antireflection coating [@1064nm] | <0.3% @1064nm |
| Point group | 32 |
| Space group | p321 |
| Electrical resistivity | 4.0×1012Ω/cm⁻¹ |
| Thickness | 0.13-0.5mm |
| Diameter | 50mm |
| Length | 90-100mm |
| Melting point | 1470℃ |
| Density | 5.67g/cm³ |
| Mohs hardness | 5.5 |
| Optical damage threshold | 670MV/cm² |
| Unit-cell parameters | a=b=0.8162nm,c=0.5087nm |
| Dielectric constant | ε₁₁=18.27 |
| Dielectric constant | ε₃₃=55.26 |
| Electro-optic coefficient | γ₁₁=2.3×10⁻¹²m/V |
| Electro-optic coefficient | γ₃₃=1.8×10⁻¹²m/V |
| Piezoelectric strain constant (10-12) d₁₁ | d₁₁=6.3 |
| Piezoelectric strain constant (10-12) d₁₄ | d₁₄=-5.4 |
| Phase velocity | 2750～2850 m/s |
| Electromechanical coupling coefficient K | 0.28～0.46 % |
| Solubility | None |
| Coefficient of thermal expansion | α₁₁=5.15×10⁻⁶K⁻¹ |
| Coefficient of thermal expansion | α₃₃=3.65×10⁻⁶K⁻¹ |
Key Features
Datasheet
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