Development of novel Q-switched fiber lasers for industrial applications

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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.