Kifle Esrom, Loiko Pavel, Romero Carolina, Vázquez de Aldana Javier Rodríguez, Ródenas Airán, Jambunathan Venkatesan, Zakharov Viktor, Veniaminov Andrey, Lucianetti Antonio, Mocek Tomas, Aguiló Magdalena, Díaz Francesc, Griebner Uwe, Petrov Valentin, Mateos Xavier
Opt Express. 2018 Nov 12;26(23):30826-30836. doi: 10.1364/OE.26.030826.
We report on the first erbium (Er) doped double tungstate waveguide laser. As a gain material, we studied a monoclinic Er:KLu(WO) crystal. A depressed-index buried channel waveguide formed by a 60 µm-diameter circular cladding was fabricated by 3D femtosecond direct laser writing. The waveguide was characterized by confocal laser microscopy, µ-Raman and µ-luminescence mapping, confirming that the crystallinity of the core is preserved. The waveguide laser, diode pumped at 981 nm, generated 8.9 mW at 1533.6 nm with a slope efficiency of 20.9% in the continuous-wave regime. The laser polarization was linear (E || N). The laser threshold was at 93 mW of absorbed pump power.
我们报道了首个掺铒（Er）双钨酸盐波导激光器。作为增益材料，我们研究了单斜晶系的Er:KLu(WO)晶体。通过三维飞秒直接激光写入技术制备了一种由直径60 µm的圆形包层形成的低折射率掩埋通道波导。该波导通过共焦激光显微镜、μ拉曼光谱和μ发光映射进行表征，证实了纤芯的结晶度得以保留。该波导激光器由981 nm的二极管泵浦，在连续波模式下，在1533.6 nm处产生了8.9 mW的功率，斜率效率为20.9%。激光偏振为线性（E || N）。激光阈值为93 mW的吸收泵浦功率。
