掺镱超快光纤激光器因光束质量好、输出功率高而被广泛应用于科学研究、工业加工、医疗诊断等领域.大模场面积的棒状光纤可以提供平均功率在百瓦量级的高能量飞秒脉冲输出,本文基于掺镱棒状光纤搭建了啁啾脉冲放大系统,详细研究脉冲输...掺镱超快光纤激光器因光束质量好、输出功率高而被广泛应用于科学研究、工业加工、医疗诊断等领域.大模场面积的棒状光纤可以提供平均功率在百瓦量级的高能量飞秒脉冲输出,本文基于掺镱棒状光纤搭建了啁啾脉冲放大系统,详细研究脉冲输入功率对脉冲放大及压缩的影响.实验结果表明,在低放大功率下(<160 W)增大输入功率可提升放大效率且脉冲压缩质量基本不受影响;当放大功率进一步增大时,需选择合适的输入功率避免积累过量非线性相位.该啁啾脉冲放大系统可将20 W圆偏光输入放大至305 W,压缩后产生平均功率为273 W、能量为273μJ的264 fs脉冲,脉冲平均功率和峰值功率比Pedersen课题组(Pedersen M E,Johansen M M,Olesen A S,Michieletto M,Gaponenko M,Maack M D 2022 Opt.Lett,475172)结果约提升了一倍.展开更多
基于机械剥离方法,即通过胶带反复剥离高定向热解石墨,制备得到少层石墨烯,并将其作为可饱和吸收体实现了被动谐波锁模掺铒光纤激光器。在抽运功率约135 m W时,获得了中心波长1568.3 nm,脉冲宽度1.82 ps,3 d B带宽1.7 nm,重复频率1.646 ...基于机械剥离方法,即通过胶带反复剥离高定向热解石墨,制备得到少层石墨烯,并将其作为可饱和吸收体实现了被动谐波锁模掺铒光纤激光器。在抽运功率约135 m W时,获得了中心波长1568.3 nm,脉冲宽度1.82 ps,3 d B带宽1.7 nm,重复频率1.646 MHz的基频锁模激光输出。通过增加抽运功率和调节腔内偏振,可以获得谐波锁模,谐波阶数最高达到基频的47阶(77.36 MHz)。同时,研究了不同阶谐波锁模时,输出功率、脉冲宽度和单脉冲能量的变化。展开更多
A compact all-fiber polarization-maintaining Er:laser using a nonlinear amplifying loop mirror is reported. Fundamental single-pulse mode-locking operation can always self start, with a cavity round-trip decreased fro...A compact all-fiber polarization-maintaining Er:laser using a nonlinear amplifying loop mirror is reported. Fundamental single-pulse mode-locking operation can always self start, with a cavity round-trip decreased from ~ 4.7 m to~ 1.7 m. When the pulse repetition rate is 121.0328 MHz, output pulse is measured to have a center wavelength/3-d B spectral bandwidth/radio frequency signal to noise ratio(SNR)/pulse width of 1571.65 nm/18.70 nm/80 d B/477 fs, respectively. Besides, three states including the exponential growth, damping state, and steady state are investigated through the build-up process both experimentally and numerically. Excellent stability of this compact Er:laser is further evaluated,demonstrating that it can be an easy-fabrication maintenance-free ultrafast candidate for the scientific area of this kind.展开更多
文摘掺镱超快光纤激光器因光束质量好、输出功率高而被广泛应用于科学研究、工业加工、医疗诊断等领域.大模场面积的棒状光纤可以提供平均功率在百瓦量级的高能量飞秒脉冲输出,本文基于掺镱棒状光纤搭建了啁啾脉冲放大系统,详细研究脉冲输入功率对脉冲放大及压缩的影响.实验结果表明,在低放大功率下(<160 W)增大输入功率可提升放大效率且脉冲压缩质量基本不受影响;当放大功率进一步增大时,需选择合适的输入功率避免积累过量非线性相位.该啁啾脉冲放大系统可将20 W圆偏光输入放大至305 W,压缩后产生平均功率为273 W、能量为273μJ的264 fs脉冲,脉冲平均功率和峰值功率比Pedersen课题组(Pedersen M E,Johansen M M,Olesen A S,Michieletto M,Gaponenko M,Maack M D 2022 Opt.Lett,475172)结果约提升了一倍.
文摘基于机械剥离方法,即通过胶带反复剥离高定向热解石墨,制备得到少层石墨烯,并将其作为可饱和吸收体实现了被动谐波锁模掺铒光纤激光器。在抽运功率约135 m W时,获得了中心波长1568.3 nm,脉冲宽度1.82 ps,3 d B带宽1.7 nm,重复频率1.646 MHz的基频锁模激光输出。通过增加抽运功率和调节腔内偏振,可以获得谐波锁模,谐波阶数最高达到基频的47阶(77.36 MHz)。同时,研究了不同阶谐波锁模时,输出功率、脉冲宽度和单脉冲能量的变化。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61805282,11802339,and 11504420)the Opening Foundation of State Key Laboratory of High Performance Computing,China(Grant No.201601-02)+2 种基金the Open Research Fund of Hunan Provincial Key Laboratory of High Energy Technology,China(Grant No.GNJGJS03)the Opening Foundation of State Key Laboratory of Laser Interaction with Matter,China(Grant No.SKLLIM1702)the China Postdoctoral Innovation Science Foundation(Grant No.BX20180373)
文摘A compact all-fiber polarization-maintaining Er:laser using a nonlinear amplifying loop mirror is reported. Fundamental single-pulse mode-locking operation can always self start, with a cavity round-trip decreased from ~ 4.7 m to~ 1.7 m. When the pulse repetition rate is 121.0328 MHz, output pulse is measured to have a center wavelength/3-d B spectral bandwidth/radio frequency signal to noise ratio(SNR)/pulse width of 1571.65 nm/18.70 nm/80 d B/477 fs, respectively. Besides, three states including the exponential growth, damping state, and steady state are investigated through the build-up process both experimentally and numerically. Excellent stability of this compact Er:laser is further evaluated,demonstrating that it can be an easy-fabrication maintenance-free ultrafast candidate for the scientific area of this kind.
