Nunes J J, Sojka Ł, Crane R W, Furniss D, Tang Z Q, Mabwa D, Xiao B, Benson T M, Farries M, Kalfagiannis N, Barney E, Phang S, Seddon A B, Sujecki S
Opt Lett. 2021 Aug 1;46(15):3504-3507. doi: 10.1364/OL.430891.
This Letter, to the best of our knowledge, reports mid-infrared fiber lasing beyond 5 µm at room temperature for the first time, -doped, chalcogenide glass, step index fiber employed in-band pumping with a 4.15 µm quantum cascade laser. The lasing fiber is was 64 mm long, with a calculated numerical aperture of 0.48 at the lasing wavelengths. The core glass was atomic % (at. %), doped with 500 parts-per-million-by-weight Ce, with a 9 µm core diameter. The cladding glass was at. % with a 190 µm outer diameter. As pump power increases continuous wave lasing corresponding to the →, transition in the ion occurs at 5.14 µm, 5.17 µm, and 5.28 µm.
据我们所知，这封信首次报道了在室温下基于掺铈硫系玻璃阶跃折射率光纤实现的波长超过5μm的中红外光纤激光。该激光光纤使用4.15μm量子级联激光器进行带内泵浦。激光光纤长度为64mm，在激光波长处计算得到的数值孔径为0.48。纤芯玻璃为原子百分比（at.%），掺杂了百万分之500重量比的铈，纤芯直径为9μm。包层玻璃为原子百分比，外径为190μm。随着泵浦功率增加，对应于铈离子中某跃迁的连续波激光在5.14μm、5.17μm和5.28μm处产生。
