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High-performance carbon nanotube coatings for high-power laser radiometry



Krishna Ramadurai, Christopher L. Cromer, Laurence A. Lewis, Katie Hurst, Anne Dillon, Roop Mahajan, John H. Lehman


Radiometry for the next generation of high-efficiency, high-power industrial lasers requires thermal management at optical power levels exceeding 10 kW. Laser damage and thermal transport present fundamental challenges for laser radiometry in support of common manufacturing processes, such as welding, cutting, ablation, or vaporization. To address this growing need for radiometry at extremely high power densities, we demonstrate multiwalled carbon nanotube (MWCNT) coatings with damage thresholds exceeding 15 000 W/cm2 and absorption efficiencies over 90% at 1.06 υm. This result demonstrates specific design advantages not possible with other contemporary high-power laser coatings. Furthermore, the results demonstrate a performance difference between MWCNTs and single-walled carbon nanotube coatings, which is attributed to the lower net thermal resistance of the MWCNT coatings. We explore the behavior of carbon nanotubes at two laser wavelengths (1.06 and 10.6 υm) and also evaluate the optical-absorption efficiency and bulk properties of the coatings.
Journal of Applied Physics


carbon nanotubes, damage threshold, Effective Medium, Raman spectroscopy, thermal detector


Ramadurai, K. , Cromer, C. , Lewis, L. , Hurst, K. , Dillon, A. , Mahajan, R. and Lehman, J. (2008), High-performance carbon nanotube coatings for high-power laser radiometry, Journal of Applied Physics, [online], (Accessed February 26, 2024)
Created January 3, 2008, Updated January 27, 2020