The wavefront measurement technique using the Shack Hartmann wavefront sensor has been developed for measurement of wavefront distortion of a SR extraction mirror for the beam profile monitor at Photon Factory. The instrument consists of a multi-lens array ( 8x8 array, 250 mm pitch and focal length of 4.5 mm), a beam expander (20:1), an image relay lens system (1:1), a HeNe laser (633 nm) and a...

PURPOSE To compare the effect of wavefront-guided and wavefront-optimized LASIK using different laser platforms on subjective quality of vision. METHODS The dominant eyes of 55 participants with myopia were randomized to receive either wavefront-guided LASIK treatment by the VISX Star S4 IR Custom-Vue excimer laser system (Abbott Medical Optics, Inc., Santa Clara, CA) or wavefront-optimized t...

The image quality of a two-photon microscope is often degraded by wavefront aberrations induced by the specimen. We demonstrate here that resolution and signal size in two-photon microcopy can be substantially improved, even in living biological specimens, by adaptive wavefront correction based on sensing the wavefront of coherence-gated backscattered light (coherence-gated wavefront sensing, C...

The wavefront set provides a precise description of the singularities of a distribution. Because of its ability to control the product of distributions, the wavefront set was a key element of recent progress in renormalized quantum field theory in curved spacetime, quantum gravity, the discussion of time machines or quantum energy inequalitites. However, the wavefront set is a somewhat subtle c...

In a seminal paper [1], Kung et al proposed that wavefront computation could be used to specify and implement parallel algorithms for the mathematical computations needed for highperformance signal processing. In [1], a wavefront computation is regarded as executing in a data-driven fashion on a two-dimensional grid of computational cells that have a north-southeast-west interconnection network...

Context. Wavefront sensing in solar adaptive-optics is currently done with correlating Shack-Hartmann sensors, although the spatialand temporal-resolutions of the phase measurements are then limited by the extremely fast computing required to correlate the sensor signals at the frequencies of daytime atmospheric-fluctuations. Aims. To avoid this limitation, a new wavefront-sensing technique is ...

In this paper, a wavefront curvature sensor is presented. This sensor is based on the measurements of the differentials of wavefront slopes, where the wavefront slope measurements can be achieved by a Shack-Hartmann sensor. A ShackHartmann sensor with three output collimated beams will be introduced with a lenslet array installed in each beam. By shifting two of the Shack-Hartmann grids in the ...

A compact wavefront camera that allows users to quantitatively measure the intensity and wavefront at a remote object plane is reported. The camera is built from a chip-scale wavefront sensor that we previously developed. By measuring the wavefront of the image and calibrating the wavefront relationship between the image and object planes, the wavefront at the object plane can be computed and t...

n appropriate arrangement of finger joints is very important since the stability of grasping an obj :atly depends on that arrangement. Multijointed fingers can grasp an object with many points of conl :h of which is pressed against the object as if wrapping up that object. The amount of the wrapped up a d the form of the finger when an object is grasped are therefore important factors for deter...