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1·Since laser appeared, pure monochromatic coherent light sources of high intensity have been achieved. In many practical problems, there are miscellaneous Fresnel's diffraction calculations.

激光出现以后，人们获得了高强度、高单色性的相干光源，在许多实际问题中，将遇到繁杂的菲涅耳衍射的计算。