Effect of chopping on laser penetration of metal targets

Autor:	Y. Domankevitz, Hoi Sing Kwok, J. A. Copley, H. S. Kim
Rok vydání:	1989
Předmět:	Materials science Physics and Astronomy (miscellaneous) business.industry chemistry.chemical_element Yttrium Penetration (firestop) Threshold energy Laser Neodymium law.invention X-ray laser Optics chemistry Duty cycle law business Laser drilling
Zdroj:	Applied Physics Letters. 55:726-728
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.101787
Popis:	A new technique for increasing the laser penetration efficiency of metals has been developed. By amplitude modulating a free‐running neodymium:yttrium aluminum garnet laser pulse, the depth of the crater was increased and the threshold energy for reliable hole drilling was decreased significantly. It was observed that the effect of chopping was optimal at 8–12 kHz with a 70% duty cycle. We believe that this improvement is due to an increase in the vapor recoil pressure and reduced plasma screening. Possible acoustic resonance effects have also been considered and will be discussed.
Databáze:	OpenAIRE
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