Special Section on Laser Damage II

Fiber laser heating and penetration of aluminum in shear flow

[+] Author Affiliations
Sean M. Baumann

Air Force Institute of Technology, Department of Engineering Physics, 2950 Hobson Way, Wright-Patterson Air Force Base, Ohio 45433-7765, United States

Oak Ridge Institute for Science and Education, 1299 Bethel Valley Road, Oak Ridge, Tennessee 37831-0117, United States

Benjamin E. Hurst

Air Force Institute of Technology, Department of Engineering Physics, 2950 Hobson Way, Wright-Patterson Air Force Base, Ohio 45433-7765, United States

Michael A. Marciniak

Air Force Institute of Technology, Department of Engineering Physics, 2950 Hobson Way, Wright-Patterson Air Force Base, Ohio 45433-7765, United States

Glen P. Perram

Air Force Institute of Technology, Department of Engineering Physics, 2950 Hobson Way, Wright-Patterson Air Force Base, Ohio 45433-7765, United States

Opt. Eng. 53(12), 122510 (Aug 12, 2014). doi:10.1117/1.OE.53.12.122510
History: Received March 31, 2014; Revised June 10, 2014; Accepted July 21, 2014
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Abstract.  Laser damage experiments were performed on painted and unpainted aluminum coupons using a 1.07-μm fiber laser at irradiances ranging from 0.2 to 1.4kW/cm2 in a wind tunnel operating at Mach 0.1 to 0.9. Coupon penetration times of 0.5 to 10 s were measured using a silicon photodiode viewing a Lambertian scatter plate placed behind the target. Despite the thin, 0.81 to 0.95 mm, samples and large laser spot diameters, 2 to 3 cm, the effects of radial heat conduction dominate for irradiances of <1kW/cm2. The fluence required to melt the back surface scales linearly with paint absorbance and the effects of paint aging have been observed. Penetration times for gray-painted aluminum at 287W/cm2 decrease by 45% as the airflow speed increases from M=0.1 to M=0.2, but remains constant for flow speeds up to M=0.7.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Sean M. Baumann ; Benjamin E. Hurst ; Michael A. Marciniak and Glen P. Perram
"Fiber laser heating and penetration of aluminum in shear flow", Opt. Eng. 53(12), 122510 (Aug 12, 2014). ; http://dx.doi.org/10.1117/1.OE.53.12.122510


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