17 July 2014 Temperature-dependent 780-nm laser absorption by engineering grade aluminum, titanium, and steel alloy surfaces
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Abstract
The modeling of laser interaction with metals for various applications requires a knowledge of absorption coefficients for real, commercially available materials with engineering grade (unpolished, oxidized) surfaces. However, most currently available absorptivity data pertain to pure metals with polished surfaces or vacuum-deposited thin films in controlled atmospheres. A simple laboratory setup is developed for the direct calorimetric absorptivity measurements using a diode-array laser emitting at 780 nm. A scheme eliminating the effect of convective and radiative losses is implemented. The obtained absorptivity results differ considerably from existing data for polished pure metals and are essential for the development of predictive laser-material interaction models.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Alexander M. Rubenchik, Sheldon S. Wu, V. Keith Kanz, Mary M. LeBlanc, W. Howard Lowdermilk, Mark D. Rotter, Joel R. Stanley, "Temperature-dependent 780-nm laser absorption by engineering grade aluminum, titanium, and steel alloy surfaces," Optical Engineering 53(12), 122506 (17 July 2014). https://doi.org/10.1117/1.OE.53.12.122506 . Submission:
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