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Lasers without inversion: Interference of lifetime-broadened resonances

Journal Article · · Phys. Rev. Lett.; (United States)
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.
Research Organization:
Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305
OSTI ID:
6355869
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 62:9; ISSN PRLTA
Country of Publication:
United States
Language:
English