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17 July 2014 Temperature-dependent 780-nm laser absorption by engineering grade aluminum, titanium, and steel alloy surfaces
Alexander M. Rubenchik, Sheldon S. Wu, V. Keith Kanz, Mary M. LeBlanc, W. Howard Lowdermilk, Mark D. Rotter, Joel R. Stanley
Author Affiliations +
Funded by: US Department of Energy, National Nuclear Security Administration, U.S. Department of Energy (DOE), Lawrence Livermore Nat. Lab., U.S. Department of Energy by Lawrence Livermore National Laboratory, Lawrence Livermore National Laboratory, U.S. Department of Energy
Optical Engineering, Vol. 53, Issue 12, 122506 (July 2014). https://doi.org/10.1117/1.OE.53.12.122506
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) 0091-3286/2014/$25.00 © 2014 SPIE
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Alexander M. Rubenchik, Sheldon S. Wu, V. Keith Kanz, Mary M. LeBlanc, W. Howard Lowdermilk, Mark D. Rotter, and 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
Published: 17 July 2014
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KEYWORDS
Aluminum
Absorption
Temperature metrology
Metals
Oxides
Oxidation
Semiconductor lasers
CHORUS Article. This article was made freely available starting 17 July 2015
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