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Some optical properties of four-level media via coherent and incoherent pumping fields

Naseri, T ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1364/JOSAB.30.000641
  3. Publisher: Optical Society of American (OSA) , 2013
  4. Abstract:
  5. The optical properties of a four-level atomic system via coherent and incoherent pumping fields are investigated. The giant Kerr nonlinearity with reduced linear and nonlinear absorption, which has a major role in decreasing the threshold of optical bistability (OB), can be obtained with subluminal light propagation via adjusting the intensities of coupling fields. An incoherent pumping field is noticed to be an extra parameter to reduce the threshold of OB and multistability, and it can be used as an effective parameter in producing lasing with or without population inversion. In this model, optical multistability is achieved simply by tuning the intensity of coupling laser fields. Furthermore, it is shown that the subluminal and the superluminal light propagation can be obtained by appropriate values of the incoherent pumping rate
  6. Keywords:
  7. Light propagation ; Effective parameters ; Four-level atomic system ; Incoherent pumping ; Incoherent pumping fields ; Nonlinear absorptions ; Optical multistability ; Population inversions ; Superluminal light ; Optical properties
  8. Source: Journal of the Optical Society of America B: Optical Physics ; Volume 30, Issue 3 , 2013 , Pages 641-648 ; 07403224 (ISSN)
  9. URL: https://www.osapublishing.org/josab/abstract.cfm?uri=josab-30-3-641