CHICAGO, July 25 -- Rubicon Technology Inc., a Chicago-area manufacturer of exotic optical-grade materials for the opto-electronics market, announced it has raised $9.5 million in its second round of investment. The investment was syndicated by four leading venture firms, including Cross Atlantic Capital Partners, Chicago-based KB Partners, Cincinnati-based River Cities Capital Funds and lead investor Gazelle TechVentures. Rubicon will use the funds to increase its production capabilities and further its development of larger-diameter sapphires and new exotic materials. 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