Theory of passively mode-locked lasers with self-frequency shift and saturable absorber response

• 来源期刊: 中国物理(英文版)
• 关键词: passively mode-locked laser saturable absorber variational method
• 年，卷（期）: 2005,（6）
• 页码范围: 1174-1180
• 页数: 7页
• 语种: 英文

摘要

A general theoretical model for passively mode-locked lasers is presented, in which both the self-frequency shift and either a fast or a slow saturable absorber response are taken into account. An exact soliton-like solution and condition for its existence are obtained under a definite compatible condition. The stability of the solution is analyzed by using a variational method, and a parameter region, in which the solution is linearly stable, is acquired theoretically. To verify the theoretical predictions, a typical example is given for stable pulse propagation over a long distance. The numerical results show that the soliton-like solution is stable under some perturbations within the linearly stable region and an arbitrary Gaussian pulse converges to the exact soliton-like solution after evolution in a distance.