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Analysis and design of high output power from a two-arm coherently combined Q-switched fiber laser

In this work, we have developed an analytical model of an actively Q-switched Ytterbium doped fiber laser by using two coupled cavities with amplifying fibers in Mach-Zehnder interferometer configuration. We demonstrate that this oscillator system provides record high peak power nanosecond pulse. This study shows that the energy obtained is almost twice the energy of an individual fiber laser. We have theoretically demonstrated that the coherent combining efficiency up to 99%. This concept brings some novel perspectives for scaling the high energy and high peak power of single mode Q-switched fiber lasers.