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[en] We introduce a two-dimensional Bose–Einstein condensation model consisting of massive photon and photon-pair. Based on the new nonlinear model, the traditional process of second harmonics generation is reinvestigated. In order to describe the process, a new quantum phase, the harmonic phase, is introduced. The order parameter of the new physical phase is also given in this paper. (paper)
Journal
Chinese Physics. B; ISSN 1674-1056; 
; v. 27(3); [5 p.]
; v. 27(3); [5 p.]