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Spatial And Temporal Coherence In Laser Pdf

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Coherence (physics)

In this paper, we present the first measurements of the partial spatial coherence of the EUV emission from xenon plasma in laser-plasma source, based on a double stream gas puff target. The Young double slit approach was employed to measure complex coherence factor of the EUV Xe emission at The number of coherently emitted photons was sufficient to demonstrate coherent imaging. Using partially coherent radiation from such source Gabor EUV holography was successfully demonstrated. X-ray nanoscience and nanotechnology often requires both spatially and temporary coherent sources of short wavelength radiation. Experiments and techniques, such as coherent diffraction imaging [ 1 ], holography [ 2 ] or interferometry [ 3 ], are not feasible without the use of coherent photon beams.

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Speckle reduction in coherent information processing Abstract: Speckle reduction techniques have been developed as one of the most active research fields in coherent optical information processing, together with the investigations of speckle statistics and coherence theory. The principles of speckle reduction are classified to five categories: 1 control of spatial coherence, 2 control of temporal coherence, 3 spatial sampling, 4 spatial averaging, and 5 digital image processing. This paper surveys the research works in the field of speckle reduction techniques involving four categories 1 -4 which have been conducted in the past 30 years. Article :.

Note: this box searches only for keywords in the titles of encyclopedia articles. For full-text searches on the whole website, use our search page. Note: the article keyword search field and some other of the site's functionality would require Javascript, which however is turned off in your browser. Find more supplier details at the end of this encyclopedia article , or go to our. Coherence is one of the most important concepts in optics and is strongly related to the ability of light to exhibit interference effects. A light field is called coherent when there is a fixed phase relationship between the electric field values at different locations or at different times. Partial coherence means that there is some although not perfect correlation between phase values.

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Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. A Publisher Correction to this article was published on 01 February

In physics , two wave sources are perfectly coherent if their frequency and waveform are identical and their phase difference is constant. Coherence is an ideal property of waves that enables stationary i. It contains several distinct concepts, which are limiting cases that never quite occur in reality but allow an understanding of the physics of waves, and has become a very important concept in quantum physics. More generally, coherence describes all properties of the correlation between physical quantities of a single wave, or between several waves or wave packets. Interference is the addition, in the mathematical sense, of wave functions. A single wave can interfere with itself, but this is still an addition of two waves see Young's slits experiment. Constructive or destructive interferences are limit cases, and two waves always interfere, even if the result of the addition is complicated or not remarkable.

Complex lasers with controllable coherence

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Coherence properties of different light sources and how they affect the image quality of holographic display are investigated. Temporal coherence is related to the intrinsic spectrum bandwidth of the light source, while spatial coherence can be affected by the size of the light source and propagation distance in use. These two coherence properties are measured for various light sources of diode-pumped solid-state DPSS laser, laser diode LD , light emitting diode LED , super luminescent light emitting diode sLED and micro light emitting diode mLED in different settings, together with the quality of the holographic reconstructed images. Although the image sharpness and speckle are related to both coherence parameters, our results and subsequent analysis show that the spatial coherence can be linked directly to the image sharpness and the temporal coherence to the speckle. This will provide a quantitative way not only to optimize the image quality between uniformity and sharpness but also to determine the safety power level for different light sources when viewing the produced images by human eyes directly.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. A Publisher Correction to this article was published on 01 February

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In physics, coherence means a property of waves — coherent waves are able to interfere as they have a constant phase relation.

Complex lasers with controllable coherence

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1 Comments

Forrest G. 17.05.2021 at 12:18

The average temporal (longitudinal) and spatial (transverse) coherence of free electron laser pulses in the extreme ultraviolet (XUV) at FLASH is measured by.

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