Effect of thermal flow field on the output field distribution of liquid lasers
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摘要: 为了研究液体流速对输出光场的影响,采用数值模拟的方法,模拟了硬边正支非稳腔的有源流体激光器的输出场,并用有限元差分法分析了不同流速条件下热流场分布,得到了在平面波抽运光抽运,并考虑介质的增益饱和时其输出光场的光束质量和光斑中心(峰值强度),在实验观察到了液体流动时光斑中心发生了偏移。结果表明,当液体流速大于1 m/s时,光束质量趋于定值,激光光斑中心偏向于受抽运面的侧面。Abstract: In order to study the effect of liquid velocity on laser output field,the output characteristics for hard-edge positive branch unstable resonators in transverse-flow liquid lasers were simulated with finite element difference method algorithm. The thermal flow field for different liquid velocities was analyzed by means of finite element method.The beam quality and laser spot center (peak intensity) were studied when the pump light was plane wave.The offset of spot center was observed in the experiment.The result is that the laser quality is tending to the constant and the laser spot center is biased to the pumped side when the liquid velocity is larger than 1m/s.
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Keywords:
- lasers /
- liquid laser /
- laser diode /
- unstable resonator /
- laser spot center
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