Cascading of second-order processes in a planar Ti-indiffused LiNbO3 waveguide: Application to frequency shifting

Year: 1999

Authors: Ramponi R., Osellame R., Marangoni M., Banfi G.P., Cristiani I., Tartara L., Palchetti L.

Autors Affiliation: Ist. Naz. Per Fis. Della Materia P., Dipto. di Fisica and CEQSE, 20133, Milan, Italy; Ist. Naz. Per Fis. Della Materia D., Univ. di Pavia, Via Ferrata 1, 27100, Pavia, Italy; Ist. Ricerca Onde Elettromagnetiche, CNR, 50127, Florence, Italy

Abstract: We studied the cascading of two second order processes and its use for frequency conversion (generation of a pulse at frequency ?-p$/-?? from a signal at ?-p$/+?? under the action of a pump at ?-p$/) in a planar Ti-indiffused lithium niobate waveguide. Consistently with the predictions of a numerical model based on the fabrication parameters of the waveguide and the substrate refractive index, we find that the TE1 mode best serves as the intermediate sum-frequency field for the TM0 signals and pump. With a propagation length of 17 mm, pulses of 20 ps time duration and ?˜1.1 µm, we observed wavelength conversion with 4% efficiency when the energy of the pump pulse per unit width was about 20 µJ/m.

Journal/Review: OPTICS COMMUNICATIONS (PRINT)

Volume: 172 (1)      Pages from: 203  to: 209

More Information: We thank V. Degiorgio and V. Russo for useful discussions. We acknowledge financial support from the special project \’Madess II\’ of the Consiglio Nazionale delle Ricerche (Italy).
KeyWords: Light propagation; Lithium niobate; Optical frequency conversion; Pumping (laser); Refractive index; Titanium, Second order processes, Optical waveguides
DOI: 10.1016/S0030-4018(99)00593-3