Patent ID: 7940451
Filing Date: 2011-05-10
Classification: G02F

Abstract:
1. A wavelength converter for entering incident light of one (λ 1 =λ 2 ) or two (λ 1 and λ 2 , or λ 1 and λ 3 ) wavelengths having a relationship of 1/λ 3 =1/λ 2 +1/λ 1 into a nonlinear optical material to output a converted light of a wavelength λ 3 or λ 2 , wherein the nonlinear material has a periodic structure, the sign of a nonlinear optical constant being alternately inverted in a propagating direction of light with a period Λ 0 , and wherein an initial phase for each period Λ 0 is varied so that a variation of the initial phase is changed for a different period Λ ph , wherein: refractive indexes for the nonlinear material relative to the wavelengths λ