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Birefringence phase-matched direct Third-Harmonic Generation in a ridge optical waveguide based on KTiOPO4 single crystal

Birefringence phase-matched Third-Harmonic Generation at 1594 nm is performed for the first time in a KTiOPO4 single crystal micrometric ridge waveguide. The energy conversion efficiency reaches 3.4% for a pump energy as low as 2 µJ over a pulse duration of 15 ps at a repetition rate of 10 Hz. Strong agreements between theory and experiments for both phase-matching and conversion efficiency is obtained, which let envision future Triple Photons Generation quantum experiments.

Augustin Vernay,1 Véronique Boutou,1,4 Corinne Félix,1 David Jegouso,1 Florent Bassignot, 2 Mathieu Chauvet 3 and Benoit Boulanger 1,5

1 Univ. Grenoble Alpes, CNRS, Institut Néel, 38000 Grenoble, France

2 Femto-Engineering, 15B avenue des Montboucons, 25000 Besançon, France

3 FEMTO-ST Institute, UMR CNRS 6174, University of Bourgogne Franche-Comté, 15B avenue des Montboucons, 25000 Besançon, France

4 veronique.boutou@neel.cnrs.fr

5 benoit.boulanger@neel.cnrs.fr          

Optics Express 2021, 29, 14, 22266-22274

DOI : 10.1364/OE.432636

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