8 November 2007 Noise characteristics of second-harmonic generation in quasi-phase-matched periodically poled lithium niobate
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Proceedings Volume 6796, Photonics North 2007; 679618 (2007) https://doi.org/10.1117/12.778928
Event: Photonics North 2007, 2007, Ottawa, Canada
Abstract
In this paper, noise characteristics of second-harmonic generation (SHG) in periodically poled lithium niobate (PPLN) using the quasi-phase-matching (QPM) technique are studied experimentally. In the experiment, a 0.78-&mgr;m second-harmonic (SH) wave was generated when a 1.55-&mgr;m fundamental wave passed through a PPLN crystal (bulk or annealed proton-exchanged waveguide). The fundamental and SH waves were then separated through a beam splitter and sent to two photodetectors, respectively. The time-domain and frequency-domain characteristics of the fundamental and SH waves were analyzed. By using the pump-probe method, the noise characteristics were studied further when 532-nm irradiation light co-propagated with the 1.55-&mgr;m fundamental light in the PPLN crystals. It is found that for the bulk and waveguides of PPLN crystals, the SH wave has a higher relative noise level than the corresponding fundamental wave. For the same fundamental wave, the SH wave has lower noise in a bulk crystal than in a waveguide, and in MgO-doped PPLN than in undoped PPLN. In addition, the photorefractive effect incurred by the irradiation light can influence the SHG noise.
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Yong Wang, Yong Wang, Jorge Fonseca-Campos, Jorge Fonseca-Campos, Wan-guo Liang, Wan-guo Liang, Chang-Qing Xu, Chang-Qing Xu, Ignacio Vargas-Baca, Ignacio Vargas-Baca, } "Noise characteristics of second-harmonic generation in quasi-phase-matched periodically poled lithium niobate", Proc. SPIE 6796, Photonics North 2007, 679618 (8 November 2007); doi: 10.1117/12.778928; https://doi.org/10.1117/12.778928
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