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, Benjamin E. Hurst, Michael A. Marciniak, 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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