Single-crystal fibers(SCFs)exhibit a significant potential for high-power laser applications owing to their superior thermal management capabilities.To enhance pump power and mitigate damage at the injection end of SC...Single-crystal fibers(SCFs)exhibit a significant potential for high-power laser applications owing to their superior thermal management capabilities.To enhance pump power and mitigate damage at the injection end of SCFs,a segmented YAG/Yb:YAG/YAG SCF with a diameter of~200μm was directly grown using a one-step laserheated pedestal growth(LHPG)method.The crystallinity and uniformity of the as-grown fiber were evaluated through a real-time back-reflection Laue camera system.Employing a low-loss segmented YAG/Yb:YAG/YAG SCF as the laser gain medium,investigations were conducted on both continuous-wave(CW)oscillators and ultrafast pulse amplifiers.The CW laser operation at 1030.9 nm achieved a maximum output power of 117.6 W with a slope efficiency of~46%,while the ultrafast amplifier system generated pulses with an average power of 101.2 W at a repetition rate of 30.8 MHz.To the best of our knowledge,this represents the highest average power achieved from a single-stage amplifier based on an Yb:YAG SCF.Preliminary pulse compression was performed at a signal power of 5o.6 W using a grating pair,resulting in a compressed pulse width of 786 fs with a compression efficiency of 58%.This study highlights the potential of crystal fiber lasers for a new generation of high-power laser systems.展开更多
基金National Key Research and Development Program of China(2023YFB406900)National Natural Science Foundation of China(62435012,U24A20312,52202008,62175132)+1 种基金Natural Science Foundation of Shandong Province(ZR2022QE013)Outstanding Young and Middle-aged Scholars of Shandong University(Tao Li)。
文摘Single-crystal fibers(SCFs)exhibit a significant potential for high-power laser applications owing to their superior thermal management capabilities.To enhance pump power and mitigate damage at the injection end of SCFs,a segmented YAG/Yb:YAG/YAG SCF with a diameter of~200μm was directly grown using a one-step laserheated pedestal growth(LHPG)method.The crystallinity and uniformity of the as-grown fiber were evaluated through a real-time back-reflection Laue camera system.Employing a low-loss segmented YAG/Yb:YAG/YAG SCF as the laser gain medium,investigations were conducted on both continuous-wave(CW)oscillators and ultrafast pulse amplifiers.The CW laser operation at 1030.9 nm achieved a maximum output power of 117.6 W with a slope efficiency of~46%,while the ultrafast amplifier system generated pulses with an average power of 101.2 W at a repetition rate of 30.8 MHz.To the best of our knowledge,this represents the highest average power achieved from a single-stage amplifier based on an Yb:YAG SCF.Preliminary pulse compression was performed at a signal power of 5o.6 W using a grating pair,resulting in a compressed pulse width of 786 fs with a compression efficiency of 58%.This study highlights the potential of crystal fiber lasers for a new generation of high-power laser systems.
