DEVICE AND METHOD FOR LASER-ULTRASONIC FREQUENCY CONTROL USING OPTIMAL WAVELENGTH TUNING

摘要

A system and method for generating a desired acoustic frequency content in a laser-generated ultrasonic wave emitted from a target in response to a laser pulse. The method includes generating a generation laser pulse (12) using a laser source (10). An optimal wavelength lambda 0 for the generation laser pulse is determined using a computer. The optimal wavelength data is determined from material-specific, empirically calculated data stored in a storage device (21) that is accessible to the computer. An optimal laser pulse (19) is generated by shifting the generation laser pulse to the optimal wavelength lambda 0. The optimal laser pulse is directed to the target (16) to generate the laser-generated ultrasonic wave with the desired frequency content.