CAJ | 학술논문

利用主振荡功率放大(MOPA)结构高功率皮秒脉冲全光纤激光器，对高功率皮秒脉冲放大器中自相位调制(SPM)效应进行了实验研究。激光器种子源是自行搭建的半导体可饱和吸收镜(SESAM)被动锁模光纤激光器。为了抑制非线性效应，使用一个自制重频倍增器把种子脉冲的重频增加到328 MHz后再放大。放大器部分采用三级放大结构，最终获得了中心波长为1066.5 nm，3 dB光谱线宽约为2.5 nm，平均功率为91 W的稳定皮秒脉冲激光输出。实验对光脉冲在放大的过程中自相位调制引起的光谱变化进行了研究。对激光器输出光谱的分析表明，随着功率的增大，高功率光纤激光器中自相位调制效应受到入射脉冲的初始啁啾和脉冲形状的影响程度也随着变大，与此同时还受到自陡峭效应的影响。
이용주진탕공솔방대(MOPA)결구고공솔피초맥충전광섬격광기，대고공솔피초맥충방대기중자상위조제(SPM)효응진행료실험연구。격광기충자원시자행탑건적반도체가포화흡수경(SESAM)피동쇄모광섬격광기。위료억제비선성효응，사용일개자제중빈배증기파충자맥충적중빈증가도328 MHz후재방대。방대기부분채용삼급방대결구，최종획득료중심파장위1066.5 nm，3 dB광보선관약위2.5 nm，평균공솔위91 W적은정피초맥충격광수출。실험대광맥충재방대적과정중자상위조제인기적광보변화진행료연구。대격광기수출광보적분석표명，수착공솔적증대，고공솔광섬격광기중자상위조제효응수도입사맥충적초시조추화맥충형상적영향정도야수착변대，여차동시환수도자두초효응적영향。
An experimental research on self-phase modulation (SPM) of high power picosecond pulse amplifier was conducted by high-power all-fiber picosecond pulse fiber laser with an MOPA configuration. The seed source is a self-built fiber laser passively mode-locked by semiconductor saturable absorber mirror (SESAM). To avoid nonlinear effect, the repetition rate of the seed pulse should be increased to 328 MHz through a self-made repetition multiplier before amplification. The amplifier employed a three-level amplifying structure and finally received a stable picosecond pulse laser output with a center wavelength of 1 066.5 nm, a 3 dB spectrum width of 2.5 nm, and an average power of 91 W. In the experiment, there was research on change of spectrum caused by SPM in the process of amplification. An analysis of the output spectrum of the laser demonstrates that with the increase of power, the influence of the initial chirp and the shape of the pulse on the SPM effect of high power fiber laser becomes deepens. In the mean time, it is also influenced by self-steepening effect.