Cascade and yoked superfluorescence detected by sum frequency generation spectroscopy

We investigated the superfluorescent decay process of dense rubidium atomic vapor in a cell. Using a femtosecond laser pulse, the atoms were excited from the 5S ground state to the 6P state. The 2.73 mu m and 1.37 mu m fields were generated on the cascaded decay, 6P-, 6S-, 5P, which further stimu-lated the 780 nm forward emission on the 5P-, 5S transition. Using sum frequency generation (SFG) spectroscopy, we observed all emission fields and the time delay between them, with sufficient temporal resolution. The experimen-tal results were successfully reproduced using semiclassical simulations. (c) 2022 Optica Publishing Group

Automated summary

We investigated the superfluorescent decay process of dense rubidium atomic vapor in a cell. Using a femtosecond laser pulse, the atoms were excited and emitted various fields with specific time delays. The experimental results were successfully reproduced using semiclassical simulations.