Development Update of High Index Lens Material LuAG - Sematech

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SCHOTT Lithotec High Index Lens Material LuAG Outline � Absorption 2 5 th Intern. Immersion Symposium 22-25.9.2008, The Hague, NL, � Zone Refining � Transmission Growth � Intrinsic Absorption � Laser durability � Roadmap � Summary and Outlook
SCHOTT Lithotec 3 5 th Intern. Immersion Symposium 22-25.9.2008, The Hague, NL, High Index Lens Material LuAG Absorption target is the most critical challenge for LuAG All activities focused on absorption improvement and addressed: � Raw materials purity at supplier � Lu 2O 3 ⇒ Stable quality with ppb level available, � Al 2O 3 ⇒ Reduction of impurity level by half, but 5x above Lu 2O 3 � Installation of Continuum Source Atom Absorption Spectrometer AAS (Detection limit - 1ppb) at Schott Lithotec´s own invest � Implementation of an additional purification step for Al 2O 3 at Schott ⇒ Installation of Zone refining machine � Optimization of growth conditions to control the impurity incorporation ⇒ Valence engineering
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Development Update of High Index Lens Material LuAG - Sematech

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