ALL-FIBER YTTERBIUM DOPED Q-SWITCHED FIBER LASER BASED ONCOPPER NANOPARTICLES SATURABLE ABSORBER

摘要

The Q-switching pulses generation in an Ytterbium-doped fiber laser (YDFL) passively Qswitchedby a copper nanoparticles (CuNP) based saturable absorber (SA) wasexperimentally demonstrated. The high-quality SA with a modulation depth of 36% wasfabricated by depositing nano-sized particles of Cu layer onto the surface of polyvinylalcohol (PVA) film through the thermal evaporation process. By inserting the SA into aYDFL cavity, stable Q-switched operation was achieved with the maximum pulse energyup to 7.48 nJ, the shortest pulse width of 3.89 μs and pulse repetition rates varying from 41to 104 kHz. These results suggested that CuNP could be developed as an effective SA forpulsed laser operation at 1 μm.