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Optical Engineering

Temperature-dependent 780-nm laser absorption by engineering grade aluminum, titanium, and steel alloy surfaces
Author(s): Alexander M. Rubenchik; Sheldon S. Wu; V. Keith Kanz; Mary M. LeBlanc; W. Howard Lowdermilk; Mark D. Rotter; Joel R. Stanley
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Paper 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.

Paper Details

Date Published: 17 July 2014
PDF: 8 pages
Opt. Eng. 53(12) 122506 doi: 10.1117/1.OE.53.12.122506
Published in: Optical Engineering Volume 53, Issue 12
Show Author Affiliations
Alexander M. Rubenchik, Lawrence Livermore National Lab. (United States)
Sheldon S. Wu, Lawrence Livermore National Lab. (United States)
V. Keith Kanz, Lawrence Livermore National Lab. (United States)
Mary M. LeBlanc, Lawrence Livermore National Lab. (United States)
W. Howard Lowdermilk, Lawrence Livermore National Lab. (United States)
Mark D. Rotter, Lawrence Livermore National Lab. (United States)
Joel R. Stanley, Lawrence Livermore National Lab. (United States)


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