28 January 2005 Nonlinear frequency conversion in waveguide directional couplers
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Nonlinear optical effects for frequency conversion require a phase-matching condition to efficiently generate a coherent field at the new wavelength. We find that the phase-matching condition can be replaced by a resonance condition when the nonlinear effect takes place in a waveguide directional coupler. We have previously reported this novel resonance phenomenon when the effect of second-harmonic generation occurs in waveguide directional couplers. In this paper, we present our detailed theory. An example of the design of such waveguide directional coupler is presented.
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Po Dong, Po Dong, Andrew G. Kirk, Andrew G. Kirk, } "Nonlinear frequency conversion in waveguide directional couplers", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); doi: 10.1117/12.576911; https://doi.org/10.1117/12.576911

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