GGG Substrates and Wafers

Kingwin Optics is proud to introduce its high-quality GGG (Gadolinium Gallium Garnet) Substrates and Wafers, specifically designed for use in various advanced applications within the fields of electronics, optics, and magnetics. GGG, known for its exceptional optical and mechanical properties, is a widely recognized material for the production of magneto-optical thin films, microwave isolators, and magnetic bubble memory devices.

Specifications:

Main performance parameters
Crystal structure	cube
Growth method	Tirafa
Lattice constant	a=12.376Å,(Z=8)
Melting point (°C)	1800
purity	99.95%
Density (g/cm.)3）	7.09
hardness	6-7（mohs）
refractive index	1.95
size	10×3，10×5，10×10，15×15，，20×15，20×20，
	dia2” x 0.33mm dia2” x 0.43mm 15 x 15 mm
thickness	0.5mm，1.0mm
polished	Single-sided or double-sided
Crystal orientation	<111>±0.5º
Plane orientation accuracy:	±0.5°
Edge Orientation Accuracy:	2° (up to 1° for special requirements)
Beveled wafers	Wafers with edge-oriented crystal planes inclined at specific angles (1°-45°) can be processed according to specific needs
Ra:	≤5Å（5µm×5µm）
wrap	Class 100 clean bag, Class 1000 clean room

 

Key Advantages:

• Crystal Structure & Purity: Our GGG substrates and wafers feature a cubic crystal structure with a lattice constant of a=12.376Å, ensuring excellent structural match with YIG and BIG thin film magneto-optical materials. The purity level of 99.95% guarantees superior performance and reliability.
• Thermal Expansion Coefficient: The thermal expansion coefficient of GGG is carefully controlled to match that of the epitaxial films, minimizing stress during thermal cycling and ensuring stable device performance over a wide temperature range.
• Chemical Stability: GGG exhibits excellent chemical stability, resistant to decomposition and corrosion during the high-temperature epitaxial growth processes, preserving the quality of the deposited films.
• Optical Properties: With a refractive index of 1.95, GGG substrates and wafers are ideal for applications requiring precise optical control, such as optical isolators and waveguides.
• Surface Quality: The wafers are polished to a surface roughness of Ra≤5Å (5×5µm), ensuring smooth surfaces for defect-free epitaxial growth and enhanced device performance.
• Customization: Kingwin Optics offers customized GGG substrates and wafers in various dimensions, thicknesses, and orientations to meet the specific requirements of our customers.

Application Areas:

• Magneto-Optical Devices: GGG substrates are the preferred choice for the epitaxial growth of YIG and BIG thin films, which are essential components of magneto-optical isolators, circulators, and modulators.
• Microwave Devices: As the best substrate material for making microwave isolators, GGG wafers play a critical role in ensuring the isolation of microwave signals in communication systems.
• Magnetic Bubble Memory: The majority of magnetic bubble memories are fabricated on GGG substrates, leveraging their exceptional magnetic and structural properties for high-density data storage.
• Integrated Optics: GGG wafers are also suitable for use in integrated optical circuits, taking advantage of their optical transparency and compatibility with various optical components.