SGGG (Substituted GGG) Single Crystals and Wafers

Kingwin Optics is pleased to offer high-performance SGGG (Substituted Gadolinium Gallium Garnet) single crystals and wafers, designed to meet the demanding requirements of advanced materials applications. SGGG, a modification of the classic GGG (Gadolinium Gallium Garnet) material, incorporates substitutions of ions such as calcium (Ca), magnesium (Mg), and zirconium (Zr) to enhance specific properties for targeted uses.

Specifications:

Crystal	GSGG
Molecular formula	Gd3Sc2Ga3O12
Crystal system	Cubic
Point group	Oh10
Space group	Ia3d
Molecular weight	962.8
Melting point (℃)	1820
Density (g/cm3)	6.44
Moss hardness	7.1
Lattice constant (Å)	12.554
Thermal expand coefficient (10-6K-1)	7.4
Thermal conductivity (W·m-1· K-1)	6
Refractive index (@1μm)	1.94
Phonon energy (cm-1)	741
<111> diffraction angle	25°11′
Refractive index temperature coefficient ( )×10-6,℃-1	10.5
Sellmeier equation	,S=2.734,λ0=1.0321; λ:μm

 

Advantages:

• Larger Lattice Constant: SGGG offers a larger lattice constant compared to GGG, which can be beneficial for applications requiring better lattice matching with epitaxial films or higher magneto-optical performance.
• Improved Optical Properties: With low optical loss (<0.1%/cm), SGGG wafers provide superior optical transparency, making them ideal for applications where optical quality is paramount.
• High Thermal Conductivity: The high thermal conductivity of SGGG (7.4 W m-1 K-1) ensures efficient heat dissipation during high-power operation, reducing thermal stress and improving device reliability.
• High Laser Damage Threshold: With a laser damage threshold exceeding 1 GW/cm², SGGG crystals and wafers can withstand intense laser irradiation, making them suitable for high-power laser systems.
• Customizable Compositions: The substitution of ions allows for tailored compositions to optimize specific properties, such as lattice constants, thermal expansion coefficients, or magneto-optical effects.
• Surface Quality: Kingwin Optics ensures that SGGG wafers are polished to a high degree of smoothness, typically with a surface roughness of Ra ≤ 5Å, to support defect-free epitaxial growth.

Application Areas:

• Magneto-Optical Devices: SGGG’s larger lattice constant and improved optical properties make it an excellent choice for the growth of high-performance magneto-optical films, such as YIG and BIG, used in optical isolators, circulators, and modulators.
• High-Power Laser Systems: The high thermal conductivity and laser damage threshold of SGGG crystals enable their use in high-power laser systems, where efficient heat dissipation and resistance to intense laser radiation are critical.
• Magnetic Bubble Memory: Although less common in modern applications, SGGG’s magnetic properties can still be leveraged in magnetic bubble memory devices, benefiting from its tailored lattice constants and improved material properties.
• Integrated Optics: The optical transparency and compatibility with various optical components make SGGG wafers suitable for use in integrated optical circuits, where precise optical control is essential.
• Specialized Research & Development: Due to their customizable compositions and enhanced properties, SGGG crystals and wafers are also valuable for specialized research and development projects exploring new materials and device concepts.

Kingwin Optics’ SGGG single crystals and wafers represent a significant advancement in materials technology, offering tailored properties and improved performance for a wide range of advanced applications. With their superior optical, thermal, and magneto-optical characteristics, SGGG products from Kingwin Optics are poised to make a significant impact in the fields of electronics, optics, and magnetics.