Study of the interaction mechanisms between different materials and pulses from CO2- and Nd:YAG-lasers using digital speckle photography

Natalia Miroshnikova; Olga Yalukova; Mikael Sjödahl; Istvan Sarady

doi:10.1117/12.579998

15 July 2004 Study of the interaction mechanisms between different materials and pulses from CO₂- and Nd:YAG-lasers using digital speckle photography

Natalia Miroshnikova, Olga Yalukova, Mikael Sjödahl, Istvan Sarady

Author Affiliations +

Proceedings Volume 5506, Nonresonant Laser-Matter Interaction (NLMI-11); (2004) https://doi.org/10.1117/12.579998
Event: Nonresonant Laser-Matter Interaction (NLMI-11), 2003, St. Petersburg, Russian Federation

Abstract

Pulsed irradiation from CO₂- and Nd:YAG lasers focused on the front side of different plates produces nearly instantaneous surface changes on the rear side of the plate. The responses of the materials depend on physical parameters such as pulse energy and duration, photon energy, the absorption and mechanical characteristics of the target material. The equipment built up for visualization of these phenomena consists of a cw. He-Ne laser, a digital CCD camera and a fast computer. The analysis is done using Digital Speckle Photography (DSP). Using focused and defocused laser speckle patterns, DSP enables measurement of in-plane strain fields, Brownian motion and residual micro-structural changes in the material caused by a laser pulse. Results are obtained at the frame rate of the digital camera and allow the creation of animated real-time or “movie” sequences. Results from CO₂- and Nd:YAG pulse interaction on Al₂O₃ ceramics and steel plates will be presented. The Brownian motion during the relaxation phase is more or less localized to the impacted area for both materials and both wavelengths but the relaxation times differ significantly. Steel also exhibits some residual material changes and doesn’t recover completely while Al₂O₃ returns to its initial state some time after the impact.

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Natalia Miroshnikova, Olga Yalukova, Mikael Sjödahl, and Istvan Sarady "Study of the interaction mechanisms between different materials and pulses from CO₂- and Nd:YAG-lasers using digital speckle photography", Proc. SPIE 5506, Nonresonant Laser-Matter Interaction (NLMI-11), (15 July 2004); https://doi.org/10.1117/12.579998

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KEYWORDS

Speckle

Digital photography

Digital signal processing

Nd:YAG lasers

Speckle pattern

Carbon dioxide lasers

CCD cameras

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