Effect of the fill factor on microlens array scanning systems

Abstract

The microlens array (MLA) scanning system is a relatively new solution for beam scanning, and are used in numerous applications, such as laser radar and optical communications. Excrescent light generated by overlapping divergent beams from adjacent microlenses increases with scanning angle and as a result, the rays do not fill the clear aperture of the MLA. The fill factor is proposed to characterize the fill rate of beams, and its effects on the point spread function (PSF) and modulation transfer function (MTF) are analyzed, this work can benefit the design and evaluation of MLA systems.

Analysis and Suppression of Crosstalk Beams in Microlens Array Scanning Imaging Optical System Based on the Combination of Multilayer Stop Arrays

“…The filling factor is calculated by matrix optical paraxial ray tracing using system parameters [14]. Based on the principle of minimum spherical aberration, the design method of the initial configuration of the MLA system is proposed, and the influence of the MLA system on detection range and imaging resolution is analyzed [15,16]. Aiming at the problem of obvious diffraction when light encounters small diameter components in the transmission process, the diffraction effect of microlens arrays is analyzed, and different types of aperture arrays with the same filling factor are given through geometric relationships and system parameters.…”