12 August 2014 Fiber laser heating and penetration of aluminum in shear flow
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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 1.4  kW/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 <1  kW/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 287  W/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.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Sean M. Baumann, Sean M. Baumann, Benjamin E. Hurst, Benjamin E. Hurst, Michael A. Marciniak, Michael A. Marciniak, Glen P. Perram, Glen P. Perram, } "Fiber laser heating and penetration of aluminum in shear flow," Optical Engineering 53(12), 122510 (12 August 2014). https://doi.org/10.1117/1.OE.53.12.122510 . Submission:


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