A highly sensitive method is presented for noninvasive defect analysis on thin structures with a <i>Q</i>-switched double-pulsed ruby laser with frequency doubling (347 nm). In our research we feature an all-optical arrangement, where a focused laser pulse derived from the same ruby laser (694 nm) acts as a built-in synchronous excitation source for digital holographic interferometry. The recordings are made with a CCD camera for capturing two holograms (two states of the specimen) corresponding to the two UV laser pulses with a short time separation (10–50 μs). Subtraction of the phase distribution in two digital holograms gives a fringe phase map that shows the change in deformation of the specimen between the recordings. The advantage of the proposed method is two fold. First, the use of a shorter wavelength results in a higher sensitivity. Second, owing to the induced synchronous built-in optical excitation, the specimen is not subjected to any external physical excitation devices. Experimental results are presented on identification and evaluation of defects in thin metal sheets.
© 2001 Optical Society of America
Staffan Schedin, Giancarlo Pedrini, Hans J. Tiziani, Anil K. Aggarwal, and Mikhail E. Gusev, "Highly Sensitive Pulsed Digital Holography for Built-in Defect Analysis with a Laser Excitation," Appl. Opt. 40, 100-103 (2001)