Topic
Spatial filter
About: Spatial filter is a research topic. Over the lifetime, 6170 publications have been published within this topic receiving 100451 citations.
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TL;DR: In this paper, a novel spatial filtering velocimeter for solid particle velocity measurement in gas-solid flow system is presented based on a Linear Electrostatic Sensor Array (LESA) in which a differential filter based on two LESAs is further proposed to remove the pedestal component of the output signal from the LESA.
43 citations
TL;DR: Adding a low contrast third harmonic to one component in square-wave phase changed the plaid's appearance from squares to diamonds, but adapting to the third harmonic enhanced the square appearance.
43 citations
TL;DR: In this article, the authors used high-power laser pulses with a contrast ratio of 10 7 to generate the reflecting surface and showed that the reflectivity fluctuates by an order of magnitude and that focusability of the beam is lost as the intensity is increased above 5-10 16 W cm 2.
Abstract: Recently, the use of plasma optics to improve temporal pulse contrast has had a remarkable impact on the field of high-power laser-solid density interaction physics. Opening an avenue to previously unachievable plasma density gradients in the high intensity focus, this advance has enabled researchers to investigate new regimes of harmonic generation and ion acceleration. Until now, however, plasma optics for fundamental laser reflection have been used in the sub-relativistic intensity regime (10 15 -10 16 Wcm 2 ) showing high reflectivity ( 70%) and good focusability. Therefore, the question remains as to whether plasma optics can be used for such applications in the relativistic intensity regime (>10 18 Wcm 2 ). Previous studies of plasma mirrors (PMs) indicate that, for 40fs laser pulses, the reflectivity fluctuates by an order of magnitude and that focusability of the beam is lost as the intensity is increased above 5◊10 16 Wcm 2 . However, these experiments were performed using laser pulses with a contrast ratio of 10 7 to generate the reflecting surface. Here, we present results for PM operation using high contrast laser pulses resulting 5 Author to whom any correspondence should be addressed.
43 citations
TL;DR: In this article, a spatially continuous distributed sensor mounted on a vibrating structure is examined, where the response of the distributed sensor to structural deformations is interpreted as a filtered version of the response from a point sensor to the same deformations.
43 citations
TL;DR: A simple method for non-ideal axicon-generated Bessel beam reconstruction by tilting the axicon perpendicular to its optical axis is introduced and an optimum axicon tilt angle is found where beam distortions can be compensated by inducing additional astigmatic aberrations.
Abstract: It is known that Bessel beam generation with a non-ideal axicon induces beam pattern distortions. In this paper, we introduce a simple method for non-ideal axicon-generated Bessel beam reconstruction by tilting the axicon perpendicular to its optical axis. We found an optimum axicon tilt angle where beam distortions can be compensated by inducing additional astigmatic aberrations. At optimal tilt angle, the central spot symmetry and focal depth was increased. By this method we could control crack formation symmetry in the bulk of glass, which is essential for many transparent material processing applications.
43 citations