Abstract
Based on cascaded polarization coupling and frequency doubling, we present a scheme to modulate the polarization and intensity of light in periodically poled lithium niobate. In the coupled processes, the introduction of another pump (control light) results in energy redistribution among the optical waves. Numerical results indicate that polarization of the fundamental wave and magnitude of the second harmonic (SH) can be both modulated by adjusting the intensity of control light. This result would be useful when simultaneous signal tuning and frequency conversion are desired.
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