Propagation of flat-topped multi-Gaussian beams through a double-lens system with apertures.
A general model for different apertures and flat-topped laser beams based on the multi-Gaussian function is developed. The general analytical expression for the propagation of a flat-topped beam through a general double-lens system with apertures is derived using the above model. Then, the propagation characteristics of the flat-topped beam through a spatial filter are investigated by using a simplified analytical expression. Based on the Fluence beam contrast and the Fill factor, the influences of a pinhole size on the propagation of the flat-topped multi-Gaussian beam (FMGB) through the spatial filter are illustrated. An analytical expression for the propagation of the FMGB through the spatial filter with a misaligned pinhole is presented, and the influences of the pinhole offset are evaluated.
Gao
Yanqi
Y
Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China.
Zhu
Baoqiang
B
Liu
Daizhong
D
Lin
Zunqi
Z
D000465:Algorithms; D007091:Image Processing, Computer-Assisted; D007834:Lasers; D007909:Lenses; D008853:Microscopy / Q000295:instrumentation* / Q000379:methods; D015233:Models, Statistical; D016011:Normal Distribution; D055095:Optics and Photonics; D012031:Refractometry; D012542:Scattering, Radiation