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24 March 2000 Second and third harmonic generation by cascading in a QPM LiNbO3 waveguide
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Proceedings Volume 3936, Integrated Optics Devices IV; (2000)
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States
Quasi-phase-matched (QPM) LiNbO3 waveguides are at present the most efficient device for second-harmonic- generation (SHG). They require the periodic inversion of the ferroelectric domains and the fabrication of annealed- proton-exchanged (APE) waveguides. In order to work at a wavelength of interest for telecommunications, 1300nm, we realized an APE waveguide, single-mode at such wavelength, on a periodically-poled substrate with a period of 11.7 micrometers . Domain inversion was obtained by Ti-indiffusion. The sample was linearly characterized. For the nonlinear experiment, a tunable Nd:YAG-pumped OPA was used as the light source. The maximum efficiency for SHG was found around 1300nm, within a few nanometers from the expected wavelength. The ratio among the output power of the second harmonic and of the fundamental guided mode was 56 percent. Together with the SH, the third harmonic was generated as the result of a (chi) 2 cascading process. On the basis of the result obtained, the problems connected with the design and fabrication of QPM devices will be discussed, with particular attention to the tolerance sin waveguide fabrication. It is worth noting that the two wavelengths were generated simultaneously, using a single laser source. This opens the possibility of generating multicolor output in diode-pumped QPM-waveguides.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Roberta Ramponi, Roberto Osellame, Marco Marangoni, Vera Russo, Emilia Giorgetti, Xianfeng Chen, Alessandro Carta, Francesca Gelli, and Stefano Sottini "Second and third harmonic generation by cascading in a QPM LiNbO3 waveguide", Proc. SPIE 3936, Integrated Optics Devices IV, (24 March 2000);

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