Abstract
We report on wavelength-shifting based on cascaded second-order nonlinearities1 in periodically-poled lithium niobate. Wavelength shifting from a signal s at λs=λp+Δ to a frequency-shifted signal f at λf=λp−Δ is obtained under the action of a pump p at λp: the effect is realized through the generation of the second harmonic (sh) of p and subsequent parametric amplification of s driven by sh. In the latter process f is also generated. Exploiting the advantages of quasi-phase-matching, efficient shifting is achieved at pump intensities about two orders of magnitude lower than in traditional second-order materials such as BBO.2
© 1998 IEEE
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