Coherent blue light generation: quasi-phase-matched second harmonic generation in KTiOPO4 waveguides

Noureddine Melikechi

doi:10.1117/12.590604

21 October 2004 Coherent blue light generation: quasi-phase-matched second harmonic generation in KTiOPO₄ waveguides

Noureddine Melikechi

Proceedings Volume 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications; (2004) https://doi.org/10.1117/12.590604
Event: 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, 2004, Porlamar, Venezuela

Abstract

Two issues which limit continuous wave second harmonic generation in quasi phase matched KTiOPO₄ periodically segmented waveguides are discussed. The first is the thermal loading caused by the fundamental and the second harmonic beams which degrades the quasi-phase matching condition and as a result corrupts the spectral quality of the second-harmonic field. We show that a carefully designed external temperature gradient leads to an enhancement of the conversion efficiency and control of the spectral lineshape of the output field. The second issue discussed is the poor optical coupling into quasi phase matched periodically segmented waveguides. We show that using optical interference, it is possible to increase th efficiency of the generated second harmonic significantly over coupling a single beam with the same total power. Finally, we show that using optical interference, it is also possible to considerably enhance the optical coupling efficiency into single mode fibers.

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Noureddine Melikechi "Coherent blue light generation: quasi-phase-matched second harmonic generation in KTiOPO₄ waveguides", Proc. SPIE 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, (21 October 2004); https://doi.org/10.1117/12.590604

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KEYWORDS

Waveguides

Optical fibers

Second-harmonic generation

Harmonic generation

Single mode fibers

Interferometers

Ferroelectric materials

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