Single-Shot Digital Holographic Interferometry Using a High Power Pulsed Laser for Full Field Measurement of Traveling Waves

In the past, interferometric holographic techniques have been used extensively to perform full-field, yet timeaveraged analysis of vibrational patterns. When time-resolved information was needed, optical scanning single-point measurement techniques, such as heterodyne interferometric vibrometry, were available. Recently, stroboscopically illuminated digital holography has proven to yield both full-field and time-resolved information of vibrations with nanometer range amplitudes. In this technique, short laser pulses, synchronized to the vibration phase, are recorded. Good results have been achieved for high-frequency vibrations. However, due to the low energy in a single pulse, acquisition time increases for decreasing vibration frequency in order to receive enough energy on the camera, introducing problems such as artifacts due to slow movements of the object or electronic read-out noise. In this work, stroboscopic holography is combined with a high power, frequency doubled pulsed Nd:YAG laser, which pro...