CAJ | 학술논문

构建了掺镱大模场面积单偏振光子晶体光纤飞秒激光非线性放大系统.讨论了腔内净色散量和抽运功率对振荡级输出参数的影响和振荡级参数对放大级输出参数的影响.在本实验条件下,当腔内净色散量取较大负色散时,振荡级直接输出的脉冲更宽,且携带更少的啁啾.当振荡级抽运4.53 W时,选择最接近变换极限的脉冲作为种子脉冲,放大级在60 W抽运时输出压缩后无基底的短脉冲,宽度为45.7 fs,平均功率28 W.振荡级抽运功率增加到5.08 W,放大级抽运70 W时,获得最高输出功率34.5 W,对应脉宽53.5 fs.
구건료참의대모장면적단편진광자정체광섬비초격광비선성방대계통.토론료강내정색산량화추운공솔대진탕급수출삼수적영향화진탕급삼수대방대급수출삼수적영향.재본실험조건하,당강내정색산량취교대부색산시,진탕급직접수출적맥충경관,차휴대경소적조추.당진탕급추운4.53 W시,선택최접근변환겁한적맥충작위충자맥충,방대급재60 W추운시수출압축후무기저적단맥충,관도위45.7 fs,평균공솔28 W.진탕급추운공솔증가도5.08 W,방대급추운70 W시,획득최고수출공솔34.5 W,대응맥관53.5 fs.
A femtosecond laser single-stage nonlinear amplification system composed of Yb-doped large-mode-area single-polarization photonic crystal fibers is demonstrated. Effects of net cavity dispersion and pump power on oscillator output parameters and the evolution dynamics of the amplified pulse after compression are discussed for different seed pulse parameters. Under the experimental conditions in this paper, the longer and less chirped pulses are obtained with a larger negative net intracavity dispersion in the oscillator. When a nearly-transform-limited pulse is chosen as seed pulse nder the condition of oscillator pump power of 4.53 W, the shortest nearly-pedestal-free amplified pulse is achieved under the amplifier pump power of 60 W after the dispersion is compensated by a grating pair, in which the pulse duration is 45.7 fs with an average power of 28 W at a repetition frequency of 42 MHz. When the oscillator pump power is increased to 5.08 W and most nearly-transform-limited pulses under the pump condition are selected as the seed pulses, the maximum average power of 34.5 W with a duration of 53.5 fs is obtained at an amplifier pump power of 70 W.