YAG

Undoped Yttrium Aluminium Garnet (Y3Al5O12 or YAG) is a new substrate and optical material that can be used for both UV and IR optics. It is particularly useful for high-temperature and high-energy applications. The mechanical and chemical stability of YAG is similar to that of Sapphire, but YAG is not birefringent. This particular feature is extremely important for some optical applications

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Parameter

Material and Specifications

Property	Value
Chemical formula	Y₃Al₅O₁₂
Crystal structure	Cubic
Lattice parameters	a = 11.9538Å
Density	4.55 g/cm3
Melting Point	1950°C
Refractive Index (λ=550nm)	1.84
Thermal Conductivity at 25℃ / (W·m-1·K-1)	0.14
Thermal Expansion/ (10-6 ℃)	6.9
Specific Heat at 300K/ (J·g-1·K-1)	590
Hardness (Mohs)	8-8.5
Young`s Modulus /GPa	279.9
Shear Modulus / GPa	113.8
Reflection loss	16.7%@1.06um
Poisson Ratio	n/a
Solubility	Insoluble

Polishing Specification for Optical Grade Ⅰ

Surface flatness	<λ /8@632nm
Clear aperture	>90%
Orentation tolerance	<0.5˚
Parallel	30˝
Perpendicular	15΄
Surface quality	10/5 (Scratch/Dig)
Chamfer	<0.2ⅹ45˚
Wavefront distorsion	<λ /4@632nm
Thickness/Aperture tolerance	±0.1mm

Polishing Specification for Optical Grade Ⅱ

Surface flatness	<λ /10@632nm
Clear aperture	>90%
Orentation tolerance	<0.2˚
Parallel	10˝
Perpendicular	5΄
Surface quality	10/5 (Scratch/Dig)
Chamfer	<0.2ⅹ45˚
Wavefront distorsion	<λ /8@632nm
Thickness/Aperture tolerance	±0.021mm