Figure - available from: Journal of the Optical Society of America A
This content is subject to copyright. Terms and conditions apply.
Source publication
This paper focuses on the theoretical analyzation of laser speckle reduction by utilizing a microlens array (MLA). A theoretical model was established to describe the screen effect on speckle reduction, taking into account MLA cell size and on-screen projection/detection resolution area size. The relationship between the speckle contrast ratio (SCR...
Similar publications
We study the impact of the limit on $|\dot{G}|/G$ from Lunar Laser Ranging on "nonlocal gravity", i.e. on models of the quantum effective action of gravity that include nonlocal terms relevant in the infrared, such as the "RR" and "RT" models proposed by our group, and the Deser-Woodard (DW) model. We elaborate on the analysis of Barreira et al. [1...
Abstract: The measurement of object dimensions and its distance is essential for many technical applications. The purpose of this study was to find a suitable mathematical model in order to find an easy and accurate way to determine the object dimensions and its distance. This study was divided into two parts: the first one was to determine the dim...
Citations
An electroactive despeckle diffuser (EADSD) is demonstrated using a polymer dispersed liquid crystal (PDLC) in-plane switched by two pairs of interdigitated electrodes whose directions are orthogonal. The mechanism underlying speckle suppression involves the time average of different speckle patterns during the exposure time of a detector, wherein the reorientation of LC molecules results in different speckle patterns. The introduction of interdigitated electrodes increases the diversity of the electric field in comparison with a conventional PDLC cell switched by a longitudinal electric field. Experimental results show that this device can reduce speckles more effectively owing to the more diverse electric field. The speckle reduction efficiency is approximately 55% when we drive the EADSD sample fabricated by 60 wt% E7: 40 wt% NOA65 under an exposure power of 6 mW/cm² by bipolar triangle waveforms applied to the two pairs of interdigitated electrodes with frequencies of 20 Hz and peak voltage values of 150 V, and when the phase delay of the waveforms is 90° or 270°. The EADSD is static and does not require motors to achieve vibration, which make it a superior device for speckle reduction in laser displays.
