THE ROLE OF AMPLITUDE AND PHASE SHAPING IN THE DISPERSIVE-PULSE REGIME OF A PASSIVELY MODE-LOCKED DYE-LASER

被引:5
作者
BECK, M [1 ]
WALMSLEY, IA [1 ]
机构
[1] UNIV ROCHESTER,INST OPT,ROCHESTER,NY 14627
关键词
D O I
10.1109/3.159534
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The relative contributions of nonlinear amplitude and phase modulation in determining the shape and duration of sub-100 fs pulse generated by a colliding-pulse mode-locked dye laser are examined. A phenomenological numerical model is developed that accounts consistently for the finite bandwidth of the saturable gain and absorbing media. The results of the numerical model are compared with the experimentally measured amplitude and phase of 60 fs duration pulses from a colliding-pulse mode-locked dye laser operated in the dispersive (i.e., nonsoliton) regime. Good agreement is found with the measured pulse amplitude temporal asymmetry and with the measured chirp. We show that the effect of phase shaping in this regime of operation is not to significantly shorten the pulse, but to allow the spectrum to locate the optimum position for maximum amplitude shaping to occur. The absorber sets a lower bound on the pulse duration by steepening the leading edge and generating a phase modulation on the leading edge that leads to a pulse breakup when propagated through the dispersive elements in the cavity. Our measurements provide experimental evidence of such phase modulation.
引用
收藏
页码:2274 / 2284
页数:11
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