摘要
通过对高斯光束经光阑衍射后轴上点光强分布规律的分析,详细讨论了复费涅耳数的物理意义及其应用,指出采用位相片,可将远场轴上光强提高为原高斯光束的几倍以上,而且中央光斑也比高斯光束小,并给出在激光准直中应用的例子。
The physical meaning of complex Fresnel number is discussed in detail based on the axial intensity of Gaussian beam diffracted by a hard aperture. The far field intensity on axis can be enhanced by several times of the original Gaussian beam using a suitable phase aperture. In the meantime, the central spot is smaller than the original Gaussian beam. An application example of laser collimation is given.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2000年第2期140-144,共5页
Chinese Journal of Lasers
基金
浙江省自然科学基金
关键词
复费涅耳数
衍射
光阑
complex Fresnel number, diffraction, aperture, phase plate
