PRODUCTION OF NONLINEAR OPTICAL ELEMENT

摘要

PURPOSE:To easily produce the nonlinear optical element having periodic structures with a simple apparatus. CONSTITUTION:A substrate 11 constituted with gratings having the coherent length of an org. material having optical nonlinearity as a pitch and a flat planar substrate 12 are superposed on each other. These substrates are immersed in this state into a melt 13 of the org. material having the optical nonlinearity and is then pulled up to crystallize the org. material intruding into the spacing between the substrate 11 constituted with the gratings and the flat planar 12 substrate. The resulted nonlinear optical element can easily collimate beams in application, since the radiation pattern of the SHG light beam to be emitted is spotty. The element satisfies a phase matching conditions and generates the SHG light with the high efficiency.