研究目的
To study the influence of the recovery time of the saturated state of the absorber on the pulse profile and spectrum in a fibre laser with different cavity lengths in the region of anomalous group velocity dispersion.
研究成果
An increase in the total dispersion of the cavity leads to the appearance of a low-intensity wide pedestal on the pulse profile. The finite recovery time of the losses in the absorber leads to redistribution of the pulse pedestal energy relative to the central peak, affecting the laser pulse spectrum. The results can be of interest in the development of fibre soliton lasers.
研究不足
The study is limited to numerical simulations and does not include experimental validation. The influence of the finite recovery time of the saturable absorber on the pulse profile and spectrum is investigated only for specific configurations of the fibre laser cavity.
1：Experimental Design and Method Selection:
Numerical simulation methods were used to calculate the dependences of the pulse profile and spectrum on the cavity length and the recovery time of the nonlinear absorber saturated losses. The simulation was performed using the ode45 computational procedure of the Matlab software.
2：Sample Selection and Data Sources:
The simulation was carried out for a two-micron ring fibre laser, the active medium of which was a silica fibre doped with Tm3+ ions.
3：List of Experimental Equipment and Materials:
The laser incorporates a multiplexer for delivering the pump, an active fibre, a power divider, a passive nonlinear absorber, and a passive fibre.
4：Experimental Procedures and Operational Workflow:
The pulse structure was simulated for four configurations of the fibre laser cavity, varying the cavity length and the recovery time of the saturable absorber.
5：Data Analysis Methods:
The search for a solution was carried out in the process of multiple passage of the pulse through the cavity. The optimal solution was chosen according to the condition of pulse profile stabilisation.
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