Kifle Esrom, Loiko Pavel, Vázquez de Aldana Javier Rodríguez, Romero Carolina, Ródenas Airan, Zakharov Viktor, Veniaminov Andrey, Yu Haohai, Zhang Huaijin, Chen Yanxue, Aguiló Magdalena, Díaz Francesc, Griebner Uwe, Petrov Valentin, Mateos Xavier
Opt Express. 2019 Mar 18;27(6):8745-8755. doi: 10.1364/OE.27.008745.
We report the generation of mid-infrared (~2 µm) high repetition rate (MHz) sub-100 ns pulses in buried thulium-doped monoclinic double tungstate crystalline waveguide lasers using two-dimensional saturable absorber materials, graphene and MoS. The waveguide (propagation losses of ~1 dB/cm) was micro-fabricated by means of ultrafast femtosecond laser writing. In the continuous-wave regime, the waveguide laser generated 247 mW at 1849.6 nm with a slope efficiency of 48.7%. The laser operated at the fundamental transverse mode with a linearly polarized output. With graphene as a saturable absorber, the pulse characteristics were 88 ns / 18 nJ (duration / energy) at a repetition rate of 1.39 MHz. Even shorter pulses of 66 ns were achieved with MoS. Graphene and MoS are therefore promising for high repetition rate nanosecond Q-switched infrared waveguide lasers.
我们报告了在使用二维可饱和吸收材料（石墨烯和二硫化钼）的掩埋掺铥单斜双钨酸盐晶体波导激光器中，产生了中红外（约2微米）高重复率（兆赫兹）亚100纳秒脉冲。该波导（传播损耗约为1分贝/厘米）是通过超快飞秒激光写入微加工而成。在连续波状态下，波导激光器在1849.6纳米处产生了247毫瓦的功率，斜率效率为48.7%。激光器以基横模运行，输出线偏振光。以石墨烯作为可饱和吸收体时，脉冲特性为重复率为1.39兆赫兹时，脉宽88纳秒/能量18纳焦。使用二硫化钼时，甚至实现了更短的66纳秒脉冲。因此，石墨烯和二硫化钼有望用于高重复率纳秒调Q红外波导激光器。
