title: Parametric amplification and cascaded-nonlinearity processes in common atomic system.
abstract: For the first time, we study the parametric amplification process of multi-wave mixing (PA-MWM) signal and cascaded-nonlinearity process (CNP) in sodium vapors both theoretically and experimentally, based on a conventional phase-conjugate MWM and a self-diffraction four-wave mixing (SD-FWM) processes, which are pumped by laser or amplified spontaneous emission (ASE), respectively. For laser pumping case, SD-FWM process serves as a quantum linear amplifier (a CNP) out (inside) of the resonant absorption region. While for ASE case, only the CNP occurs and the output linewidth is much narrower than that of the MWM signal due to the second selected effect of its electromagnetically induced transparency window. In addition, the phase-sensitive amplifying process seeded by two MWM processes is discussed for the first time. Theoretical fittings agree well with the experiment. The investigations have important potential applications in quantum communication.
authors.affiliation: Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, Xi'an Jiaotong University, Xi'an 710049, China.
authors.forename: Huaibin
authors.initials: H
authors.lastname: Zheng
authors.forename: Xun
authors.initials: X
authors.lastname: Zhang
authors.forename: Zhaoyang
authors.initials: Z
authors.lastname: Zhang
authors.forename: Yaling
authors.initials: Y
authors.lastname: Tian
authors.forename: Haixia
authors.initials: H
authors.lastname: Chen
authors.forename: Changbiao
authors.initials: C
authors.lastname: Li
authors.forename: Yanpeng
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000669:Amplifiers, Electronic; D003198:Computer Simulation; D060733:Electromagnetic Radiation; D054025:Lasers, Dye; D008027:Light; D008962:Models, Theoretical; D011789:Quantum Theory