|  Sapphire tubes OD∼3.0-40.0mm, wall thickness∼1.0-6.0mm>, length<600.0mm  | 
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| Ground tubes for plasma etching process | 
			As-grown tube | 
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| Sapphire crucible (ground surfaces) | 
			Sapphire crucible (one-end-closed tube) | 
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| Polished tube | 
			Polished tube |