Frequency doubling in surface periodically poled lithium niobate waveguides: Competing effects

S. Stivala, A. Pasquazi, A. C. Busacca, L. Colace, M. Cherchi, A. Parisi, A. C. Cino, S. Riva-Sanseverino, G. Assanto

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


We fabricated α-phase pro ton-exchanged (PE) lithium niobate (LN) channel waveguides quasi phase-matched (QPM) via surface periodic poling (SPP) and carried out the first experimental demonstration of second harmonic generation (SHG) in such devices.[1] Experiments were performed by employing an optical parametric amplifier/oscillator producing 25 ps pulses in the range 1.1-1.6 μm with a line-width less than 2cm−1 and a repetition rate of 10Hz. SHG measurements were performed either at a fixed wavelength by varying the fundamental frequency (FF) input power or by scanning the FF wavelength, ratioing the second harmonic (SH) output to the FF input to obtain the conversion efficiency. By repeating the SHG scan versus peak power, we observed that the wavelength for maximum conversion (the FF resonance for SHG) shifted with excitation, as visible in Fig. 1a. Otherwise stated, when performing a power scan at a fixed FF wavelength, the conversion efficiency first increased with power (as expected) and then decreased. By adjusting the wavelength, conversely, we observed a linear dependence in maximum conversion to SH (see Fig. 1c), as well as in peak SHG wavelength (see Fig. 1b).
Original languageEnglish
Title of host publicationInternational Quantum Electronics Conference 2007
PublisherOptical Society of America OSA
ISBN (Print)1-4244-931-4
Publication statusPublished - 1 Jan 2007
MoE publication typeNot Eligible
EventInternational Quantum Electronics Conference, IQEC 2007 - Munich, Germany
Duration: 17 Jun 200717 Jun 2007


ConferenceInternational Quantum Electronics Conference, IQEC 2007


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