Abstract
We propose a universal and practical scheme to realize polarization-free second-order nonlinear frequency- conversion processes, including sum-frequency generation, difference-frequency generation, and optical parametric amplification. This scheme is based on the optical superlattice with a noncritical phase-matching condition, which is suitable for optical integration. A chirped dual-period structure is proposed to ensure the efficiency and stability of the conversions.
© 2010 Optical Society of America
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