Hi Is there any VCSEL whose power is high enough to exicte the photoluminescence ?? My sample is SiCNO derived from Ceraset polymer (PUMV). Best regards, Lung-hao Hu Graduate Student Dept.of Mechanical Engineering Univ.of Colorado Boulder UCB 427 CO 80309 U.S.A Email:lung.hu@colorado.edu Tel:303-786-1702(H) 303-492-6107(O) Fax:303-492-3498