yag
(jæg)
Also YAG.
[f. the initial letters of yttrium aluminium garnet.]
A synthetic crystal of yttrium aluminium garnet, used in certain lasers and as a simulated diamond in jewellery.
| 1964 Q. Rep. Bell Telephone Lab. No. 2 (ad 439–628). 3 The splitting of the 7Fj..manifolds of the trivalent Europium and Terbium ions..has been used to calculate crystal field parameters for Eu and Tb in YAG. 1964 Appl. Physics Lett. V. 201/2 Predictions of the laser behavior were tested on singly and doubly doped YAG crystals. 1971 Daily Tel. 22 Nov. 13 Have you got a yag yet? They are the latest form of simulated diamonds. Almost as hard as a sapphire, which is almost as hard as a diamond, they are ‘grown’ in America, brought over here to be faceted, set in 18-carat gold in Hatton Garden and sold as Diamonairs. 1977 Jrnl. R. Soc. Arts CXXV. 779/2 The YAG laser..is used routinely..for trimming resistors. 1979 [see simulant n.]. 1984 National Geographic Mar. 341/2 A flash lamp can excite atoms of neodymium, a rare earth, in a rod of YAG. |