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Proceedings Paper

Evaluation of materials for on-board laser diagnostics
Author(s): James R. Luke; David Thomas; Jay Lewis; Claude R. Phipps
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Paper Abstract

The AEgis Technologies Group and RTI International are developing microsensors for High Energy Laser (HEL) diagnostic applications. The conformal sensor array will measure the irradiance profile of an incident laser beam, and concomitant rise in surface temperature of the target. The open mesh architecture allows 90% of the beam to impact the surface. A critical part of this program is developing a protective coating that ensures sensor survivability at high irradiance levels for operational lifetimes on the order of 10 seconds. The protective coating must transmit a measurable amount of light to the irradiance sensor. We have conducted experiments to evaluate candidate heat shield materials. In the first round of experiments, a 10kW CO2 laser was used to irradiate pure materials, including metals and carbon foils. Although many of the metal foils were perforated by the laser, no significant amount of material was ablated away. In fact, most of the test samples gained mass, presumably due to oxidation. Analysis of high speed video shows that once the metal melted, surface tension caused the molten metal to coalesce into droplets around the rim of the hole. The second and third rounds of testing, conducted with a 3kW, 1.07μm fiber laser, included samples of highly reflective metals and ceramics, standard plasma-sprayed coatings, and multilayer stacks. We have also measured the performance of temperature sensors and irradiance sensors fabricated from nanoparticle solutions deposited by advanced printing technology and have completed a preliminary investigation of high temperature adhesives.

Paper Details

Date Published: 14 May 2008
PDF: 9 pages
Proc. SPIE 7005, High-Power Laser Ablation VII, 70051G (14 May 2008); doi: 10.1117/12.782754
Show Author Affiliations
James R. Luke, The AEgis Technologies Group, Inc. (United States)
David Thomas, The AEgis Technologies Group, Inc. (United States)
Jay Lewis, RTI International (United States)
Claude R. Phipps, Photonic Associates, LLC (United States)

Published in SPIE Proceedings Vol. 7005:
High-Power Laser Ablation VII
Claude R. Phipps, Editor(s)

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