Numerical Modeling of Dual-Wavelength Pumped Heavily-Ho<sup>3+</sup>-Doped Fluoroindate Fiber Lasers With Efficient Output at 3.92 μm
Zhuowei Cheng, Zhi Zhang, Ruicong Wang, Shunbin Wang, Xiaoxu Li, Síle Nic Chormaic, Shijie Jia, Pengfei Wang
Abstract
In this paper, laser emission at 3.92 μm in heavily-holmium-doped fluoride fibers using 888 nm and 1660 nm laser as pumping sources is investigated through numerical modeling. The dual-wavelength pumping system has lower threshold and higher slope efficiency than the single-wavelength pumping system at 888 nm. In addition, the system can decrease the heat load due to the 1660 nm input influencing the energy transfer up-conversion and cross-relaxation processes effectively, which indicates the possibility of raising the laser heat-damage threshold and providing high-power 3.92 μm laser generation. This research represents a novel method for improving the performance of 3.92 μm fiber lasers.