Patent ID: 8264766
Filing Date: 2012-09-11
Classification: G02F

Abstract:
1. A wavelength conversion element comprising a monocrystalline nonlinear optical crystal belonging to point group 32 or point group 3, wherein the nonlinear optical crystal has: a plurality of first regions having a polarity direction along a predetermined direction; a plurality of second regions having a polarity direction opposite to the predetermined direction; an entrance face into which a fundamental incident wave having a wavelength λ and a frequency ω is incident in a direction substantially perpendicular to the predetermined direction; and an exit face from which a second harmonic with a frequency 2ω generated in the crystal emerges, and wherein the plurality of first and second regions are formed as alternately arranged in a period substantially equal to d expressed by Formula (1) or Formula (2) below, along a Z-axis direction of the crystal between the entrance face and the exit face, where n