Energy level population dynamics in terbium doped chalcogenide selenide glass fibre under pulsed pumping

Chalcogenide selenide glass fibres have been demonstrated to be well suited for realising lasers operating beyond 5000 nm wavelength with output powers exceeding 100 mW in CW. These devices have many potential commercial applications because they can be in principle tuned over a wide range of wavelengths and can also be potentially made to generate short optical pulses. Therefore in this paper we use a numerical model to study the energy level population dynamics in terbium doped chalcogenide selenide glass fibre under pulsed pumping. The results obtained further the understanding of major dynamic processes governing a mid-infrared pulse generation by a chalcogenide selenide glass host.