Muraviev Sergei V, Dorofeev Vitaly V, Koptev Maxim Y, Kim Arkady V
Opt Lett. 2024 Oct 1;49(19):5555-5558. doi: 10.1364/OL.534993.
In this paper, we provide a new experimental insight into the lasing process in the erbium-doped tellurite glass fiber at high diode-pump powers and pumping pulse durations. It is shown that lasing occurs at two wavelengths. Initially, at a fixed wavelength of 2.718 µm corresponding to the luminescence maximum, lasing takes place during the first ∼100 µs from the start of the pump pulse, while the main laser power occurs at the 2.8 µm for the rest of the pump pulse and shifts to longer wavelengths with increasing pump power. At pumping durations essentially exceeding the lifetime of the upper laser level, no self-termination of lasing occurs; on the contrary, the lasing power increases, which indicates the key role of the energy transfer upconversion (ETU) process. We demonstrate for the first time to our knowledge efficient lasing with an average power of 60 mW and a pulsed energy of 1.2 mJ in an erbium-doped zinc-tellurite fiber.
在本文中，我们针对高二极管泵浦功率和泵浦脉冲持续时间下掺铒碲酸盐玻璃光纤中的激光过程提供了新的实验见解。结果表明，激光在两个波长处产生。最初，在对应于发光最大值的固定波长2.718 µm处，从泵浦脉冲开始后的约100 µs内发生激光发射，而在泵浦脉冲的其余时间，主要激光功率出现在2.8 µm处，并随着泵浦功率的增加向更长波长移动。在泵浦持续时间基本超过激光上能级寿命的情况下，激光发射不会发生自终止；相反，激光功率增加，这表明能量转移上转换（ETU）过程的关键作用。据我们所知，我们首次在掺铒锌碲酸盐光纤中展示了平均功率为60 mW、脉冲能量为1.2 mJ的高效激光发射。
