Abstract
The use of quasi-phase-matching (QPM) technique to compensate the phase velocity difference in interacting optical waves has greatly revived the field of nonlinear optics. A plethora of research activity has benefited from the availability of periodically poled lithium niobate (PPLN) and lithium tantalate (PPLT). These structures are characterized by a periodical sign reversal in the second-order nonlinear susceptibility χ(2) every coherent length, lc = λω/4(n2ω-nω), to compensate the destructive interference caused by the material’s dispersion in the refractive index, n. Great challenge, however, remains in manipulating the coercive and fringing field to achieve a high fidelity of pattern transfer in making fine QPM structure to raise up the conversion efficiency.1 The use of quasi-phase-matching (QPM) technique to compensate the phase velocity difference in interacting optical waves has greatly revived the field of nonlinear optics. A plethora of research activity has benefited from the availability of periodically poled lithium niobate (PPLN) and lithium tantalate (PPLT). These structures are characterized by a periodical sign reversal in the second-order nonlinear susceptibility χ(2) every coherent length, lc = λω/4(n2ω-nω), to compensate the destructive interference caused by the material’s dispersion in the refractive index, n. Great challenge, however, remains in manipulating the coercive and fringing field to achieve a high fidelity of pattern transfer in making fine QPM structure to raise up the conversion efficiency.1
© 2002 Optical Society of America
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