Paper Title:
Millimeter-Wave Reactive Sintering of Neodymium-Doped Yttrium Aluminum Garnett
  Abstract

Millimeter-wave sintering of ceramic laser host materials has been under investigation for high-energy laser (HEL) applications. Advantages of polycrystalline, compared to single-crystal, laser host materials include lower processing temperature, higher gain from higher dopant concentration, cheaper fabrication, and larger devices. We are currently investigating the solid-state reactive sintering of neodymium-doped yttrium aluminum garnet (Nd:YAG) using a high power millimeter-wave beam as the heat source. The 83 GHz beam is generated in the Naval Research Laboratory (NRL) High Frequency Materials Processing Facility that is powered by a 15 kW, CW, 83 GHz GYCOM gyrotron. The starting powder is a mixture of commercially available alumina, yttria, and neodymia powders. Near transparency and over 99% theoretical density have been achieved with grain sizes of 5 to 10 µm. The fluorescence lifetime of the Nd+3 1.06 µm lasing transition was measured to be about 200 µs, in good agreement with other work. SEM studies of the sintered microstructure show residual porosity caused by trapped pores that must be eliminated to produce fully transparent material.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
2002-2005
DOI
10.4028/www.scientific.net/MSF.654-656.2002
Citation
A. M. Imam, A. W. Fliflet, S. H. Gold, R. W. Bruce, C. Stephenson, C.R. Feng, "Millimeter-Wave Reactive Sintering of Neodymium-Doped Yttrium Aluminum Garnett", Materials Science Forum, Vols. 654-656, pp. 2002-2005, 2010
Online since
June 2010
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