THIN FILM, BIAXIALLY BIREFRINGENT NONLINEAR DEVICES

摘要

Phase matching for different frequency waves of electromagnetic energy is accomplished within a thin film of nonlinear material in which the index of refraction for a wave polarized orthogonal to the plane of the film is lower than that for a wave to which it is coupled which is polarized parallel to the plane of the film, and in which the index of refraction for waves polarized parallel to the plane of the film differs depending upon beam direction. An exemplary material is polyvinylidene fluoride which is mechanically oriented by biaxial stressing and which is electrically poled.