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Optical Engineering • Open Access

Plasma enhancement of femtosecond laser-induced electromagnetic pulses at metal and dielectric surfaces
Author(s): Sanjay Varma; Jane Spicer; Benjamin Brawley; Joseph A. Miragliotta

Paper Abstract

In a previous report, we have shown that the long wavelength, electromagnetic-pulsed (EMP) energy generated by ultrashort (38 fs) laser pulse ablation of a metal target is enhanced by an order of magnitude due to a preplasma generated by a different, 14-ns-long laser pulse. Here, we further investigate this EMP enhancement effect in a 2- to 16-GHz microwave region with different target materials and laser parameters. Specifically, we show a greater than two orders of magnitude enhancement to the EMP energy when the nanosecond and ultrashort laser pulses are coincident on a glass target, and greater than one order of magnitude enhancement when the pulses are coincident on a copper target.

Paper Details

Date Published: 22 April 2014
PDF: 6 pages
Opt. Eng. 53(5) 051515 doi: 10.1117/1.OE.53.5.051515
Published in: Optical Engineering Volume 53, Issue 5
Show Author Affiliations
Sanjay Varma, Johns Hopkins Univ. Applied Physics Lab., LLC (United States)
Jane Spicer, Johns Hopkins Univ. Applied Physics Lab., LLC (United States)
Benjamin Brawley, Johns Hopkins Univ. Applied Physics Lab., LLC (United States)
Joseph A. Miragliotta, Johns Hopkins Univ. Applied Physics Lab., LLC (United States)


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