Abstract
We investigated angular tuning of quasi-phase-matching (QPM) second-harmonic generation (SHG), in order to extend the tunable range of QPM and to combine the advantages of QPM and birefringence phase-matching. The direction of the input fundamental wave vector was detuned from the QPM grating vector along the crystallographic Z-axis of a periodically-poled lithium niobate (PPLN) crystal in the XY- and XZ-planes. A larger tuning range of SHG was obtained for the detuning in the XZ-plane, continuously shifting the QPM peak of the fundamental wavelength from 1524 to 1595 nm by changing the detuning angle from 0° (parallel to X-axis as conventional QPM) to 23.2°.
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Acknowledgements
This work was supported by the National Research Foundation (NRF) Grant funded by the Ministry of Education, Science and Technology of Korea (2009-0068995). The authors appreciate useful discussion with M.M. Fejer and B. Boulanger.
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Kim, BJ., Choi, HJ. & Cha, M. Angle-tuned second-harmonic generation in periodically-poled lithium niobate. Appl. Phys. B 107, 349–353 (2012). https://doi.org/10.1007/s00340-012-4932-x
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DOI: https://doi.org/10.1007/s00340-012-4932-x