Special Section on Laser Damage II

Temperature-dependent 780-nm laser absorption by engineering grade aluminum, titanium, and steel alloy surfaces

[+] Author Affiliations
Alexander M. Rubenchik

Lawrence Livermore National Laboratory, Livermore, California 94550, United States

Sheldon S. Q. Wu

Lawrence Livermore National Laboratory, Livermore, California 94550, United States

V. Keith Kanz, Mary M. LeBlanc, W. Howard Lowdermilk, Mark D. Rotter, Joel R. Stanley

Lawrence Livermore National Laboratory, Livermore, California 94550, United States

Opt. Eng. 53(12), 122506 (Jul 17, 2014). doi:10.1117/1.OE.53.12.122506
History: Received March 10, 2014; Revised June 2, 2014; Accepted June 17, 2014
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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

Citation

Alexander M. Rubenchik ; Sheldon S. Q. Wu ; V. Keith Kanz ; Mary M. LeBlanc ; W. Howard Lowdermilk, et al.
"Temperature-dependent 780-nm laser absorption by engineering grade aluminum, titanium, and steel alloy surfaces", Opt. Eng. 53(12), 122506 (Jul 17, 2014). ; http://dx.doi.org/10.1117/1.OE.53.12.122506


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