Lasing without inversion: The double scheme Academic Article uri icon


  • We determine the conditions under which a four-level medium in a resonant cavity can start lasing when there is no population inversion between the lasing levels. The mechanism which is used is the creation of low-frequency coherence by a pair of external pump fields. it is shown that lasing with frequency upconversion requires population inversion at (low-frequency) nonlasing transitions. 1990.

published proceedings

  • Optics Communications

author list (cited authors)

  • Kocharovskaya, O., Li, R., & Mandel, P.

citation count

  • 72

complete list of authors

  • Kocharovskaya, Olga||Li, Ruo-Ding||Mandel, Paul

publication date

  • January 1990