Spatial and temporal coherence in laser pdf
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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. Some light sources such as lasers already have a high spatial and temporal coherence due to their design. For some years such sources are also available for atoms; they are based on Bose-Einstein condensates and are able to emit coherent matter waves. However, for large molecules we often have to work with incoherent thermal sources. In the case of such sources, say, the wave functions of two molecules leaving the souce from two far apart regions of the oven nozzle do not have a pre-defined phase relation to each other.
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. Holographic displays can reconstruct three-dimensional 3D images with full wavefront information 1 — 6 , which is free from issues such as lack of accommodation depth cue, discontinuous motion parallax and crosstalk 7 —
Complex lasers with controllable coherence
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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.
Spatial Versus Temporal Coherence
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