具有波纹调制激光光束的准聚焦特性
Quasi focused characteristics of laser beam with waviness modulation
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摘要: 采用光波的衍射积分理论，对具有波纹调制激光束的准聚焦特性进行了理论分析。针对中频率段畸变激光束的准聚焦特性，数值模拟研究了准聚焦光斑能量集中度、焦斑光强分布与光束波前调制周期和离焦距离的关系，并得出适当离焦距离有利于控制焦斑大小，增大激光束波前的调制周期，可增加准聚焦光斑能量集中度，降低焦斑光强的调制起伏。Abstract: Based on the diffraction integral theory, the quasi-focused characteristics of a laser beam with waviness modulation have been studied theoretically and numerically in the paper. The effect of waviness modulation and defocused distances on the energy-concentration-rate and intensity distribution as well as pattern of defocused spot have been analyzed in detail. The computing results show that to control the defocused distance or to decrease the size of waviness modulation in the median frequency will improve the energy-concentration of focal spot.
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