Numerically modeling and optimizing pulse-shape of Cr4+：YAG Q-switched lasers
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摘要: 为了研究被动调Q激光器脉冲的波形对称特性,采用数值求解Nd:YAG晶体Cr4+:YAG被动调Q激光耦合速率方程组的方法,获得了激光脉冲的波形,绘制出了"脉冲对称因子"与饱和吸收体初始透过率和输出镜反射率的关系曲线图;并根据脉冲波形的不对称性,更精确地计算了脉冲宽度,及其与饱和吸收体初始透过率和输出镜反射率的关系.得到参数b=0.6时,脉冲波形对称;b=0.78时,脉宽最小的结论.结果表明,可以通过调整b参数来优化被动调Q脉冲波形对称性和脉宽.Abstract: In order to study the symmetry property of a single pulse for passively Q-switched lasers,the coupled rate equations were solved numerically and the temporal profile of laser pulse was obtained.The relationship between the symmetry property of a single pulse and the parameters of absorber and output coupler was presented and the pulsewidth was recalculated accounting for the asymmetry property of laser pulse.The relationship between pulsewidth and parameteres of absorber and output coupler was presented also.Conclusion was drawn that the pulse was symmetric when the variable b=0.6 and that the pulsewidth was minimal when b=0.78.This provides a method to optimize the pulse shape and pulsewidth by adjusting the value of b.
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Keywords:
- lasers /
- passively Q-switching /
- pulse shape /
- pulsewidth /
- numerically modeling Cr4+：YAG
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