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lasing without inversion
Lasing without inversion (LWI) is a technique used for light amplification by stimulated emission without the requirement of population inversion. A laser working under this scheme exploits the quantum interference between the probability amplitudes of atomic transitions in order to eliminate absorption without disturbing the stimulated emission. This phenomenon is also the essence of electromagnetically induced transparency.〔Scully, M., & Zubairy, M. (1997). Chapter 7. In Quantum optics (p. 220). Cambridge: Cambridge University Press.〕
The basic LWI concept was first predicted by Ali Javan in 1956.〔Scully, M., & Zubairy, M. (1997). Chapter 7. In Quantum optics (p. 245). Cambridge: Cambridge University Press.〕〔A. Javan, Phys. Rev. 107, 1579 (1956)〕 And the first demonstration of it was carried out by Marlan Scully in an experiment in rubidium and sodium at the University of Texas at Austin, and then at NIST in Bolder.〔Javan, A. (2000). On knowing Marlan. In Ode to a quantum physicist: A festschrift in honor of Marlan O. Scully. Elsevier.〕
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