Diode-pumped CW and passively <i>Q</i>-switched lasers of Nd:GdLuAG mixed garnet at 1123 nm were demonstrated. The maximum average output power of CW operation was 4.13 W. For <i>Q</i>-switched operation, the average output power was 800 mW, the corresponding single pulse energy was 133.8 μJ. The Nd:GdLuAG laser emitting at 1123 nm was obtained for the first time to the best of our knowledge, which proves that the Nd:GdLuAG mixed garnet has a better ability of energy storage than Nd:YAG in 1123 nm oscillation.
Power propagation equations of multi-pumped fiber Raman amplifier (FRA) is reasonably simplified, multistep average power method is applied to compute composite Raman gain of multi-signals in dense wavelength division multiplexed system (DWDM) amplified by multi-pumped FRA. Based on such a simple and effective model, the influence of the number, input power and wavelength distribution of multi-pumps on Raman gain is researched, the rules to decide their values are reached and the ultra broad and flat Raman gain bandwidth is implemented. All the simulation and analyses supply helpful references for the application of multi-pumped FRA in DWDM system.