Abstract
With the help of the nonequilibrium Keldysh diagram technique we rigorously calculate the nonlinear optical susceptibility of a conjugated polymer in the SSH model for the process of Four Wave Mixing (FWM). The result is accurate in the entire frequency range for the arbitray band gap width. Slow relaxation of carriers is taken into account. The result is compared to that for the linearised TLM model. Though the latter neglects many diagrammatic processes incorporated in SSH, the resulting expressions differ by the terms proportional to the square of the ratio of the band gap to the band width, which is often a small correction. The results for Third Harmonic Generation (THG) are reproduced as a limiting case.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
