Research of the mode-locked element SBR in the femtosecond solid-state lasers
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摘要: 为了得到稳定的飞秒锁模脉冲,SBR广泛用于飞秒固体激光器中的锁模。分析了SBR的结构和光谱特性,并从密度矩阵方程出发导出了SBR的吸收系数、饱和强度与SBR的固有参数之间的关系,分析了SBR在固体激光器中的锁模机理,得到了SBR在固体激光器中锁模的基本条件,结果表明,SBR能够用于飞秒固体激光器锁模并提高锁模脉冲的质量。Abstract: The SBR is applied for mode-locking in the femtosecond solid-state lasers to obtain the steady mode-locked pulses.In this paper,the structure and the spectrum of the saturable Bragg reflector are generalized in detail,and the relation between the absorption coefficient,saturation intensity and the inherent parameters of the SBR is derived from the density matrix equations.The basic mode-locked mechanism of the SBR has been analyzed and the fundamental mode-locked conditions of SBR in the solid-state lasers has been obtained.It is found that the SBR can be used in the mode-locking of the femtosecond solid-state lasers and it can enhance the properties of mode-locked pulses.
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