Development of novel Q-switched fiber lasers for industrial applications

调Q光纤激光器在测距、激光传感、激光雷达、非线性频率转换、自由空间通信和医疗手术等方面有着广泛的应用。在各种调Q方法中，利用可饱和吸收体（SA）实现被动调Q是一种简单、方便、有效的实现高能量脉冲的方法。过渡金属掺杂的晶体和半导体SA镜是目前可用的最先进的SA。然而，生长晶体或半导体SA的制造系统复杂且昂贵。此外，这两种方法都需要使用体光学部件，这增加了插入损耗和激光系统的复杂性。因此，研究结构紧凑、性价比高的调Q光纤激光器具有重要意义。

Q-switched fiber lasers have widespread applications such as range finding, laser sensing, LIDARs, nonlinear frequency conversion, free-space communications, and medical surgery. Among various Q-switching methods, passive Q-switching by use of saturable absorber (SA) offers a simple, convenient and efficient way to achieve high energy pulse. Transition metal doped crystals and semiconductor SA mirrors are currently available state-of-the-art SAs. However, the fabrication systems of growing crystals or semiconductor SAs are complex and costly. Furthermore, both approaches require using bulk optic components, which increases insertion loss and the complexity of the laser system. Therefore, investigating compact cost-effective Q-switched fiber lasers is very important.