Sun Xiaoli, Sun Shuo, Romero Carolina, Vázquez de Aldana Javier R, Liu Fengqin, Jia Yuechen, Chen Feng
Opt Express. 2021 Feb 1;29(3):4296-4307. doi: 10.1364/OE.417815.
Low-loss depressed cladding waveguide architecture is highly attractive for improving the laser performance of waveguide lasers. We report on the design and fabrication of the "ear-like" waveguide structures formed by a set of parallel tracks in neodymium-doped yttrium aluminum garnet (Nd:YAG) crystal via femtosecond laser writing. The obtained "ear-like" waveguides are with more symmetric mode profiles and lower losses by systematically comparing the guiding properties of two kinds of normal cladding waveguide. Efficient waveguide lasers are realized based on the designed structure in both continuous wave and pulsed regimes. Combined the high-gain from cladding waveguide and special "ear-like" structure, a passively fundamentally Q-switched laser with the narrow pulse width and the high repetition rate has been obtained by using tin diselenide (SnSe) as saturable absorber.
低损耗凹陷包层波导结构对于改善波导激光器的激光性能极具吸引力。我们报道了通过飞秒激光写入在掺钕钇铝石榴石（Nd:YAG）晶体中由一组平行轨迹形成的“耳状”波导结构的设计与制备。通过系统比较两种常规包层波导的导光特性，所获得的“耳状”波导具有更对称的模式轮廓和更低的损耗。基于所设计的结构，在连续波和脉冲模式下均实现了高效的波导激光器。结合包层波导的高增益和特殊的“耳状”结构，以二硒化锡（SnSe）作为可饱和吸收体，获得了具有窄脉冲宽度和高重复率的被动基模调Q激光器。
