around the audience if you are a student and you need to verify your attendance at tonight's talk there will be some verification cards that are available following tonight's QA also out at the table outside the auditorium please turn off cell phone rings or any other electronic devices that might make noise during the program with all that said I'd like to introduce this evening speaker dr. Lee Hong Wong dr. Wong earned his BS and MS and optics from Zhang universities of Science and Technology in Wuhan China and his PhD in