Widely non-defenerate stimulated two-photon emission in semiconductors (A07)

• Subject Area: Experimental Condensed Matter Physics
• Term: from 2018 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 231447078

Two-photon emission is a process in which optical transitions occur through the simultaneous emission of two photons. Here, we will focus on experimental and theoretical studies of widely non-degenerate two-photon emission stimulated by femtosecond pulses. Similar to nonlinear optical absorptions, such processes are expected to be massively enhanced whenever the involved fields differ widely in their frequency. Specifically, we want to investigate non-degenerate two-photon emission in various optically pumped semiconductors (GaAs, GaN, ZnO, Cu2O) as a function of the frequency ratio of the driving signal and idler field and, thereby, elucidate a novel type of optical nonlinearity in semiconductors.

• DFG Programme: CRC/Transregios
• Subproject of: TRR 142: Tailored nonlinear photonics: From fundamental concepts to functional structures
• Applicant Institution: Universität Paderborn
• Project Heads: Professor Dr. Markus Betz; Professor Dr. Torsten Meier; Dr. Claudia Ruppert