CAJ | 학술논문

为了在有限抽运功率条件下探索基于大模场面积光子晶体光纤的耗散孤子锁模振荡器的能量提升潜力,本文利用多通单元将基于掺镱大模场面积光子晶体光纤锁模振荡器的腔长延展,消除了有限抽运功率的限制,使得该系统能够在较低平均功率水平下获得更高的单脉冲能量.实验上构建了重复频率低至15.58 MHz的高能量光子晶体光纤锁模脉冲振荡器,并通过分别使用6 nm带宽和12 nm带宽的两种不同带宽的光谱滤光片,能够直接输出平均功率分别为3.73 W和4.9 W的啁啾脉冲,对应单脉冲能量分别为239 nJ和314 nJ.经过光栅对去啁啾后,最窄脉冲宽度分别为56 fs和75 fs,对应峰值功率均超过3 MW.
위료재유한추운공솔조건하탐색기우대모장면적광자정체광섬적모산고자쇄모진탕기적능량제승잠력,본문이용다통단원장기우참의대모장면적광자정체광섬쇄모진탕기적강장연전,소제료유한추운공솔적한제,사득해계통능구재교저평균공솔수평하획득경고적단맥충능량.실험상구건료중복빈솔저지15.58 MHz적고능량광자정체광섬쇄모맥충진탕기,병통과분별사용6 nm대관화12 nm대관적량충불동대관적광보려광편,능구직접수출평균공솔분별위3.73 W화4.9 W적조추맥충,대응단맥충능량분별위239 nJ화314 nJ.경과광책대거조추후,최착맥충관도분별위56 fs화75 fs,대응봉치공솔균초과3 MW.
To investigate the energy scaling level of large-mode-area photonic crystal fiber-based dissipative soliton mode-locked fiber os-cillators under limited pump power, a multipass cell is inserted in the cavity to lower the repetition rate of the system, and thus higher single energy level can be mapped under the same average power level. High energy mode-locked fiber lasers based on two spectral filters with different bandwidths are demonstrated both working in the all-normal dispersion regime at a repetition rate of 15.58 MHz. Employment of filters with FWHMs of 6nm and 12 nm can achieve stable mode-locked pulses with average powers of 3.73 W and 4.9 W, corresponding to single pulse energies as high as 239 nJ and 314 nJ, respectively. The FWHM durations of the dechirped pulses by a transmission grating pair can reach 56 fs and 75 fs, which can generate pulses with peak powers exceeding 3MW in both cases.