Results 211 to 220 of about 8,993 (261)
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Measurement of the wavefront of XUV sources
Le Journal de Physique IV, 2001New fields of x-ray sources applications (x-ray laser and High Order Harmonic Generation) could appear if an intensity higher than 10 12 Wcm -2 is reached. Following this goal, we have started a complete investigation of the x-ray beam wavefront both numerically and experimentally.
S. Le Pape +10 more
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The Theoretical Effect of Measured Wavefront Diameter on Estimating Peripheral Wavefront Data
Journal of Refractive Surgery, 2004<p>ABSTRACT</p><p>PURPOSE: To compare the difference between wavefront data measured in the periphery and that calculated from estimations using a smaller measured region.</p><p>METHODS: A total of 32 eyes were measured using the Alcon LADARWave aberrometer (Alcon Laboratories Ine, Fort Worth, Tex).
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Traceable measurements with wavefront sensors
SPIE Proceedings, 2005Wavefront sensors, particularly those of the Hartmann-Shack type are now available in commercial form from several manufacturers. They have found increasing use in medical and industrial applications and, for consistent measurements over a range of instruments and measurement situations, traceability of measurement is essential.
S. D. Knox, S. R. Hall, R. F. Stevens
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Journal of Cataract and Refractive Surgery, 2003
To evaluate the accuracy and repeatability of the WaveScan WavePrint system and the Tracey wavefront aberrometer in measuring refractive errors in phakic eyes.Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.Using subjective manifest refraction (MR) as the standard, the spherical equivalent (SE), sphere, and cylinder were compared ...
Li, Wang, Nan, Wang, Douglas D, Koch
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To evaluate the accuracy and repeatability of the WaveScan WavePrint system and the Tracey wavefront aberrometer in measuring refractive errors in phakic eyes.Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.Using subjective manifest refraction (MR) as the standard, the spherical equivalent (SE), sphere, and cylinder were compared ...
Li, Wang, Nan, Wang, Douglas D, Koch
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MEASUREMENT OF THE AXIAL WAVEFRONT ABERRATION OF THE HUMAN EYE
Ophthalmic and Physiological Optics, 1985Abstract— An objective variation of Howland and Howland's subjective crossed‐cylinder aberroscope method of estimating ocular aberration is described. An ophthalmoscopic arrangement allows the distorted retinal image of the aberroscope grid to be directly photographed for later analysis.
G, Walsh, W N, Charman
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Visualization and measurement of ultrasonic wavefronts
Proceedings of the IEEE, 1979The transmission of ultrasonic wavefronts through a medium and the reflection of these wavefronts from an object or interface depend upon the bulk mechanical properties of the medium or object. Measuring or visualizing the wavefront yields important information about various transmission media and objects under study and has found application in ...
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Wavefront Distortion Measurement at SSRF
2017Proceedings of the 8th Int.
Gao, Bo +5 more
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Wavefront measurements on semiconductor lasers
IEEE Journal of Quantum Electronics, 1983Two-dimensional phase measurements of the far field of semiconductor lasers have been performed. An accuracy of one fiftieth of a wavelength has been obtained. In this paper, we will briefly describe the method used and present some results. It was possible to determine the neat-field behavior of both the amplitude and the phase from the measured fat ...
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Parameters for Wavefront Sensor Measurement
2010Wavefronts cannot be perceived because it is light intensity rather than phase that interacts directly with matter. Detectors such as our eye respond to brightness levels, not differences in optical path length. Detectors in wavefront sensors also respond to light level. However, this response is related to some kind of length measurement. This chapter
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Wavefront phase measurement of striae in optical glass
Applied Optics, 2022Sérgio Bonaque-González +2 more
exaly