Phys. Rev. Lett. 62, 2813–2816 (1989)Degenerate quantum-beat laser: Lasing without inversion and inversion without lasingReceived 10 February 1989; published in the issue dated 12 June 1989 A single lasing mode driven by a three-level ‘‘quantum-beat’’ atomic configuration can show gain without population inversion or optical absorption into an excited state without spontaneous or stimulated emission. © 1989 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.62.2813
DOI:
10.1103/PhysRevLett.62.2813
PACS:
42.50.Md, 42.55.-f
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