Making and identifying optical superpositions of high orbital angular momenta

National Natural Science Foundation of China (NSFC) [11104233]; Fundamental Research Funds for the Central Universities [2011121043, 2012121015]; Natural Science Foundation of Fujian Province of China [2011J05010]; Program for New Century Excellent Talents in Fujian Province University; program for New Century Excellent Talents in University of China (NCET)