【摘要】 采用受激布里渊散射(SBS)噪声起源理论模型,数值模拟了透镜焦距对SBS光限幅功率特性和能量特性的影响.结果表明,改变透镜焦距就可以方便的控制SBS光限幅的功率波形和输出能量.当采用焦距适中的透镜(f=15cm)时,可以得到较低的限幅输出能量;当采用短焦距的透镜(f=5cm)时,可以得到较理想的限幅功率波形.在实验上将波长1064nm、脉宽8ns、能量16mJ的Nd:YAG激光脉冲聚焦到CCl4介质中,研究了限幅功率波形和限幅输出能量随透镜焦距的变化规律,实验结果与理论模拟相符合.更多还原

【Abstract】 Adopting noise initiation mode of stimulated Brillion scattering （SBS）, the influence of focal length on optical limiting power and energy is numerically simulated. It shows that the characteristic of limiting power and energy are controlled by focal length. When focal length is moderate, say 15cm, the limiting energy is lowest. When focal length is short, say 5cm, the characteristic of limiting power is close to ideal. In experiment, focusing 8ns, 1064nm, 16mJ pulses into CCl₄ medium, the variation of limiting power and energy versus focal length is investigated. The experimental results are in good agreement with the conclusions predicted by the simulations.更多还原