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Proceedings Paper

Enhancement of electromagnetic pulse emission from ultrashort laser pulse irradiated solid targets
Author(s): Joseph Miragliotta; Jane Spicer; Benjamin Brawley; Sanjay Varma
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Paper Abstract

Ultrashort laser pulses (~100 fs duration) are known to generate charge separation in solid, liquid and gas targets through a variety of nonlinear mechanisms. This process results in the emission of a broadband electromagnetic pulse (EMP) in the microwave and terahertz (THz) regions of the electromagnetic spectrum. Possible applications of this phenomenon include remote RF and THz generation for material detection and diagnostics. We investigate the energy and spectrum of the EMP emitted from copper and glass targets irradiated by single 800 nm, 38 fs duration pulses with varying energy. The detector is two feet from the target and the detection bandwidth is 2-18 GHz. We also demonstrate our ability to enhance the emitted EMP energy from a copper target by more than an order of magnitude by irradiating the target with a 1064 nm, 14 ns duration pulse at a specific time delay relative to the ultrashort pulse. We attribute the increased optical to RF energy conversion to enhanced absorption of the ultrashort pulse by the nanosecond pulse-generated plasma at the surface of the target.

Paper Details

Date Published: 7 May 2012
PDF: 7 pages
Proc. SPIE 8381, Laser Technology for Defense and Security VIII, 83811N (7 May 2012); doi: 10.1117/12.920631
Show Author Affiliations
Joseph Miragliotta, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Jane Spicer, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Benjamin Brawley, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Sanjay Varma, The Johns Hopkins Univ. Applied Physics Lab. (United States)

Published in SPIE Proceedings Vol. 8381:
Laser Technology for Defense and Security VIII
Mark Dubinskii; Stephen G. Post, Editor(s)

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