Temperature-dependent 780-nm laser absorption by engineering grade aluminum, titanium, and steel alloy surfaces
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
When modeling laser interaction with metals for various applications it requires a knowledge of absorption coefficients for real, commercially available materials with engineering grade (unpolished, oxidized) surfaces. But, 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. Futhermore, 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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1226979
- Report Number(s):
- LLNL-JRNL-635613
- Journal Information:
- Optical Engineering, Vol. 53, Issue 12; ISSN 0091-3286
- Publisher:
- SPIE
- Country of Publication:
- United States
- Language:
- English
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