Lasing without or with inversion in a closed four-level system Article

cited authors

  • Zhu, Y

fiu authors


  • I show that a closed four-level system pumped by a single laser exhibits the following features: lasing without population inversion in any state basis, lasing with population inversion in the dressed-state basis, and lasing with population inversion in the bare-state basis. The system can also exhibit a large refractive index with either zero or negative absorption. © 1993 The American Physical Society.

publication date

  • January 1, 1993

Digital Object Identifier (DOI)

start page

  • 495

end page

  • 499


  • 47


  • 1