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1  kHz 3.3  μm Nd:YAG KTiOAsO4 optical parametric oscillator system for laser ultrasound excitation of carbon-fiber-reinforced plastics

Oliver Puncken, David Mendoza Gandara, Marcin Damjanic, Peter Mahnke, Ralf B. Bergmann, Michael Kalms, Peter Peuser, Peter Wessels, Jörg Neumann, and Ulf Schnars

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Abstract

We present a new laser prototype for laser ultrasonics excitation. The fundamental wavelength of a Q-switched Nd:YAG laser with a repetition rate of 1 kHz is converted to 3.3 μm with a KTiOAsO4 optical parametric oscillator. The achieved pulse energy at 3.3 μm is 1.7 mJ, and the pulse duration at the fundamental wavelength of 1.06 μm has been measured to be 21 ns. The ultrasonic excitation efficiency is about 3.5 times better compared to the application of state-of-the-art CO2 lasers.

© 2016 Optical Society of America

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