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Non-hot-image-plane intense fringe from double scatterers in an intense laser beam through cascaded Kerr medium disks.

We theoretically investigate beam properties in a laser system of two scatterers with cascaded Kerr medium disks. A non-hot-image-plane intense fringe may appear when an intense laser beam passes through cascaded Kerr medium disks, which is modulated by double scatterers. It is found that besides generating hot images at expected positions, a new intense fringe appears at a position of about tens of centimeters downstream of the hot-image plane. The intensity of this intense fringe is greater than that of the first hot image, and it is sufficient to damage the optical elements. The effects of object distance, wavelength, and width of scatterer on the properties of this intense fringe are investigated, and we find that this intense fringe appears under certain conditions. Its intensity is closely related to several factors, such as the distance from the scatterer to the first Kerr medium disk, the scatterer width, and the wavelength of the incident beam, as well as the position of this intense fringe, which is not varied with the object distance.