The present invention provides a flexible noncontact source of wave energy through the use of time reversal. In the preferred embodiment a differential laser vibrometer is employed to measure the vibration of a sample surface. Thus, the time reversal noncontact source can be configured to provide an out of plane vibration source or an in plane vibration source, or any combination of the two.
STATEMENT REGARDING FEDERAL RIGHTS
 This invention was made with government support under Contract No. DE-AC52-06NA25396, awarded by the U.S. Department of Energy. The government has certain rights in the invention.