Phys. Rev. Lett. 62, 1033–1036 (1989)Lasers without inversion: Interference of lifetime-broadened resonancesReceived 23 September 1988; published in the issue dated 27 February 1989 We show that if two upper levels of a four-level laser system are purely lifetime broadened, and decay to an identical continuum, then there will be an interference in the absorption profile of lower-level atoms, and that this interference is absent from the stimulated emission profile of the upper-level atoms. Laser amplification may then be obtained without inversion. Examples include interfering autoionizing levels, and tunneling systems. © 1989 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.62.1033
DOI:
10.1103/PhysRevLett.62.1033
PACS:
42.55.Bi, 32.70.Jz, 32.80.Dz
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