Undoped Yttrium Aluminium Garnet (Y3Al5O12 or 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. We provide high quality and optical homogenity YAG with different dimensions and specifications for the use in industrial, medical and scientific fields. YAG is grown utilising the Czochralsky technique. The as-grown crystals are then processed into rods, slabs or prisms, coated and inspected per customer specifications. YAG shows no trace absorbtion in the 2 - 3 µm region where Glasses tend to be highly absorbent because of the strong H2O band.

Main properties Crystal structure cubic Transmission range, nm 250 - 5000 Density, g/cm3 4.5 Mohs hardness ~8.5 Specific heat, W x s x g-1 x °K-1 0.59 Thermal conductivity, W x cm-1 x °K-1 0.14 Thermal expansion coefficient 6.9 x 10-6 x °K-1 Thermal shock resistance, W x m-1 790 Termooptical factor (dn/dT), at 633 nm 7.3 x 10-6 x °K-1 Refractive indexes: - at 0.8 µm 1.8245 at 1.0 µm 1.8197 at 1.4 µm 1.8121 Main Specifications of YAG Windows Orientation [111] within 5° Diameter +/-0.1mm Thickness +/-0.2mm Flatness better than l/8@633nm Parallelism better than 30'' Perpendicularity better than 5' Scratch-Dig 20-10 per MIL-O-1383A Wavefront Distortion better than l/2 per inch@1064nm Deliveries from ground blanks to finished as well as processed optical elements are possible.

I N Q U I R Y    F O R M :

Material:	Undoped YAG	Quantity of elements:
Application:		polished sites:    or	a-b b-c a-c or d
Orientation: (if applicable)		Dimensions/Tolerances:	For example: 10.0 +/- 0.1
AR-coating:		a = mm; c = mm	b = mm or dia. = mm;

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