LGS (Lanthanum Gallium Silicate) Crystal
Keywords:
Scintillation Crystals
- Product Introduction
- Key advantages
- Application areas
- Product Features
-
- Commodity name: LGS (Lanthanum Gallium Silicate) Crystal
LGS (Lanthanum Gallium Silicate) Crystal, with chemical formula La₃Ga₅SiO₁₄ is a high-performance, multifunctional crystal that serves as an optically nonlinear material with an exceptionally high damage threshold.
Product Introduction
LGS (Lanthanum Gallium Silicate) Crystal,with Chemical formula (La₃Ga₅SiO₁₄) is a high-performance, multifunctional crystal renowned for its exceptional optical nonlinear properties and exceptionally high damage threshold. It boasts a high electro-optic coefficient and outstanding electro-optic performance, crystallizing in the trigonal system with a relatively low thermal expansion coefficient and minimal anisotropy in thermal expansion. Moreover, it exhibits excellent thermal stability at elevated temperatures—outperforming even quartz crystals. Notably, LGS possesses two independent electro-optic coefficients comparable to those of BBO crystals, while maintaining stable electro-optic values across a wide temperature range. The crystal also demonstrates superior mechanical strength, chemical inertness, non-hygroscopic behavior, and remarkable physical and chemical stability, making it a material of exceptional overall performance.
LGS crystals feature a wide transmission range, exhibiting high transmittance across the ultraviolet to mid-infrared spectrum—from 242 nm up to 3550 nm. Grown via the Czochralski method, LGS crystals have a melting point of 1470°C and undergo no phase transition from growth temperature down to room temperature. They also boast a short growth cycle, enabling the production of large-sized crystals. Notably, LGS crystals possess optical activity, though they are smaller than quartz. These crystals are ideal for applications such as electro-optic modulation and electro-optic Q-switching. Additionally, LGS-based electro-optic switches are well-suited for high-repetition-rate operations and can deliver high output energy, making them versatile tools for a wide array of applications.
Key Advantages
- High thermal stability
- Low equivalent series resistance
- High electromechanical coupling coefficient (3 to 4 times higher than that of quartz).
- Good optical rotation
- Withstand temperature fluctuationsApplication Areas
- Electro-optic Q-wwitch
- Bulk acoustic wave filters, resonators
- Gyroscopes, etc.
- SAW, BAW devices
- Sensors
- High-power, high-repetition-rate all-solid-state laser
- High-and-low temperature aariable laserProduct Features
Material Properties
Crystal Structure
Triclinic
Density
5.754 g/cm³
Mohs Hardness
6.6 Mohs
Resistivity
>1×10¹² Ω·cm (25°C)
Relative Dielectric Constant
ε₁₁/ε₀=19.2; ε₃₃/ε₀=50.7
Thermal Expansion Coefficient
α₁₁= 5.07×10⁻⁶/K; α₃₃ = 3.60×10⁻⁶/K
Piezoelectric Constants
e11=0.43; e22=0.1039
Refractive Index (@2091nm)
no=1.92, ne=1.87 (@2091 nm)
Electro-Optic Coefficient
γ₁₁=2.3×10⁻¹²m/V, γ₃₃=1.8×10⁻¹² m/V
Electromechanical Coupling Coefficient, K [％]
0.28 to 0.46
Melting Point
1470°C
Product Processing Indicators
Effective Aperture
>90%
Dimensional Tolerance
(W±0.1 mm)×(H±0.1 mm)×(L±0.2 mm)
Chamfer
≤0.2×45°
Surface Quality
20-10 S-D
Flatness
≤λ/10 @ 632.8 nm
Parallelism
<30"
Perpendicularity
≤15′
Chipped Edge
<0.1 mm
Coating
Customized to Customer Specifications
-
- Strong electro-optic effect: Ideal for high-speed optical modulation.
- High dielectric constant: Beneficial for surface acoustic wave and ultrasonic sensor applications.
- Excellent thermal stability: Suitable for high-temperature environments.
- Wide optical transparency range: Exhibits excellent light transmission across wavelengths from ultraviolet to mid-infrared.
- High sensitivity
- Wide range of transparency
- Not easily deliquescent -
- Optical communication: Used in electro-optic modulators and optical switches.
- Precision sensing: Applied in accelerometers, temperature sensors, and more.
- Laser technology: Used in laser frequency doublers, modulators, and more.
- Medical devices: Piezoelectric sensors used in ultrasound equipment.
- Surface acoustic wave devices: such as wireless filters and delay lines.
- Optical storage, transient recording
- High-speed holographic camera -
Material Properties Lattice constant a = 5.154 Å, c = 13.783 Å Density 7.45g/cm3 Color Colorless Mohs Hardness 5.5–6 on the Mohs scale Through the range 400–5000 nm Resistivity 1015wm
Dielectric constant es11/e0:39~43 es33/e0:42~43 et11/e0:51~54 et33/e0:43~46 Coefficient of thermal expansion aa = 1.61 × 10⁻⁶/K, ac = 4.1 × 10⁻⁶/K Refractive index no = 2.176, ne = 2.180 (@633 nm) Electro-optic coefficient r33 = 30.4 pm/V Heat Capacity (Cp) 100 J/k.mol Curie Temperature 610°C Melting point 1650°C Product Processing Metrics Effective Aperture >90% Dimensions Customized to customer specifications Diameter Tolerance +0 / -0.05 mm Dimensional Tolerance ±0.05 mm Protective Chamfer ≤0.2 × 45° Surface finish 10-5 S-D Flatness ≤λ/6 @ 632.8 nm Parallelism <20" Verticality ≤15′ Chipped edge < 0.1 mm Coating Customized to customer specifications
Previous page:
Next page:
Online Quotation Request
Please provide your phone number and email address, and we’ll get in touch with you as soon as possible.