Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814, USA.
J Acoust Soc Am. 2011 Sep;130(3):1091-4. doi: 10.1121/1.3614545.
A superposition of propagating Bessel beams was recently numerically demonstrated to approximate a Gaussian beam and was used to evaluate the scattering by a sphere centered on the focal point of the beam. An analytical beam synthesis used in optics by Agrawal and Pattanayak [J. Opt. Soc. Am. 69, 575-578 (1979)] is found here to be recovered as the weak focusing limit of the quasi-Gaussian beam when evanescent contributions are omitted from the analytical synthesis. The propagating-wave part of the analytical synthesis has similarities to, and differences from, the recent quasi-Gaussian approximation.
最近有人通过数值方法演示了贝塞尔光束的叠加可以近似高斯光束，并将其用于评估位于光束焦点上的球体的散射。Agrawal 和 Pattanayak 在光学中使用的一种解析光束合成方法[J. Opt. Soc. Am. 69, 575-578 (1979)]在这里被发现，当解析合成中忽略消逝贡献时，它是准高斯光束的弱聚焦极限。解析合成的传播波部分与最近的准高斯近似有相似之处，也有不同之处。
