Abstract

We report on wavelength-shifting based on cascaded second-order nonlinearities¹ in periodically-poled lithium niobate. Wavelength shifting from a signal s at λ_s=λ_p+Δ to a frequency-shifted signal f at λ_f=λ_p−Δ is obtained under the action of a pump p at λ_p: 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