Phys. Rev. Lett. 7, 444–446 (1961)Optical Maser Action of Nd+3 in a Barium Crown GlassReceived 6 November 1961; published in the issue dated 15 December 1961 © 1961 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.7.444
DOI:
10.1103/PhysRevLett.7.444
PACS:
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