Patent ID: 7492507

Claim:
A method of fabricating a wavelength conversion device comprising a nonlinear optical material, an input face, an output face, and a waveguide region extending from the input face to the output face, the method comprising: identifying a phase matching wavelength λ Φ of the wavelength conversion device, wherein the phase matching wavelength λ Φ corresponds to a lasing wavelength of an input signal emitted by a laser at which the wavelength conversion device converts the frequency of the input signal at approximately a maximum conversion efficiency; determining an ideal poling period Λ I for the phase matching wavelength λ Φ of the wavelength conversion device; and poling the nonlinear optical material by inducing into the waveguide region sequentially positioned domains comprising randomly varying domain widths defined by the ideal poling period Λ 1 plus or minus a disruption value such that: a Bragg resonance and corresponding back reflections of light from the wavelength conversion device poled at the randomly varying domain widths to the laser are at least an order of magnitude less than the Bragg resonance and back reflections of a nonlinear optical material poled at the ideal poling period Λ I ; and a conversion efficiency of the input signal by the wavelength conversion device poled with the randomly varying domain widths is at least half the maximum conversion efficiency.