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A hard synthetic yttrium aluminum garnet used in laser technology and as a gemstone.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


an artificial yttrium aluminium garnet used in jewellery and in lasers
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



a synthetic yttrium aluminum garnet, used for infrared lasers and as a gemstone.
[1960–65; y(ttrium)a(luminum)g(arnet)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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The YAG vessel replacement program (ORCAs) was to provide and have proven to be an invaluable asset in meeting all of these goals", said Vice-Admiral Buck (ret'd), who was chief of the maritime staff when the ORCA program was approved.
An errant laser or even the reflection off a metallic surface can quickly blind an observer, whether [CO.sub.2] or YAG. While [CO.sub.2] can be stopped by glass (eye-glasses) or plexiglass, YAG's shorter wavelength requires an opaque barrier (usually metal, although drywall will do) and special (expensive) viewing windows.
The premium for YAG over [CO.sub.2] remains large--approximately double, although there has been some improvement in the key consumable, the flash lamps, Rofin Sinar's Walker reports.
A 400 W YAG laser in a welding mode costs about $9/hr and, in a cutting mode, $10 to $11.A 1-kW YAG laser is probably $15/hr to $16/hr running cost for welding."
A key factor is that the energy conversion factor for YAG is only 4%--you must buy 25 kW of electric power to get 1 kW in laser energy.
But there are some negatives that will slow down the spread of YAG laser use:
"With 1-kW YAG, you can weld stainless-steel pipe to depths up to 0.5".
The YAG:Ce powder with a composition corresponding to the chemical stoichiometry formula of [Y.sub.3][Al.sub.5][O.sub.12]:Ce was synthesized from the above mentioned precursor materials.
There are many methods used for the preparation of the YAG powder with a high crystallinity, a large luminous power, and a small particle size, such as methods using solid-state reaction [7-10], coprecipitation, [11-13] and sol-gel process [14].
In order to measure the particles size with the LB550 machine, it is necessary to dissolve the YAG:Ce powder in a solution.
With the aim of producing nano-YAG:Ce phosphor powder, a dispersion solution with uniform nanoparticles of the YAG:Ce was prepared by using a nanosteam technique (NST).
Rare earth elements such as neodymium and erbium can be doped into YAG as active laser ions, yielding YAG:Nd and YAG:Er lasers, respectively.