Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 109, Issue 4, Pages 573-579Publisher
SPRINGER
DOI: 10.1007/s00340-012-5156-9
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Funding
- Office of the Chief Scientist, The Israeli Ministry of Industry, Trade and Labor
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The commonly used periodic patterning for quasi phase-matching plane-waves is theoretically adequate for completely depleting and transferring a fundamental wave to its second harmonic. However, when working with Gaussian beams the conversion efficiency of such a design lacks due to the inherent Gouy phase shift and the spatially varying beam profile, yielding roughly 88 % conversion efficiency. In this paper, we study the possibility of adding a linear chirp and Gouy-phase shift compensation to the periodic poling. We demonstrate that this poling pattern enables us to achieve near-optimal frequency doubling efficiency of up to 97 %.
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