Abstract
A new way to control the harmonic mode-locking and multiple pulsing operation with the pulse duration unaffected of a Kerr-lens mode-locked Ti:sapphire laser was demonstrated. When the effective nonlinear length of the nonlinear medium which was inserted in the Ti:sapphire laser was varied by changing the position of the medium or the pump power of the laser, stable harmonic mode-locking and multiple-pulse operation were observed.
Highlights
As an effective way to generate high repetition rate pulsed laser sources, multi-pulse operation based harmonic mode-locking has drawn much attention in both bulk and fiber lasers [1,2,3,4,5,6,7]
When the effective nonlinear length of the nonlinear medium which was inserted in the Ti:sapphire laser was varied by changing the position of the medium or the pump power of the laser, stable harmonic mode-locking and multiple-pulse operation were observed
These results are explained well by side-lobe pulse generation and transient gain depletion and recovery
Summary
As an effective way to generate high repetition rate pulsed laser sources, multi-pulse operation based harmonic mode-locking has drawn much attention in both bulk and fiber lasers [1,2,3,4,5,6,7]. Peak-power-limiting effect was proved to be responsible for multi-soliton generation in a passively mode-locked fiber laser [11], and the gain depletion and recovery dynamics in the gain medium was successfully used in understanding different pulse spacings in soliton lasers [12]. We experimentally demonstrate that harmonic mode-locking and multi-pulse operation in a KLM Ti:sapphire laser can be controlled by varying the intra-cavity Kerr effect, which is performed by tuning the position of an inserted nonlinear crystal or changing the pump intensity. For a stable multi-pulse operation, the value of the intra-cavity net negative dispersion is limited by the Kerr effect. These results allow us a better understanding of the multi-pulse operation of the KLM laser and provide a possible way to control it
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