High efficiency cascaded third-harmonic generation in a quasi-periodically poled KTiOPO4 crystal

Augustin Vernay, Lucas Bonnet-Gamard, Véronique Boutou, Sivan Trajtenberg-Mills, Ady Arie, Benoît Boulanger

Research output: Contribution to journalArticlepeer-review

Abstract

We performed and studied cascaded third-harmonic generation (THG) in a quasi-periodically poled KTP (QPPKTP) crystal allowing simultaneous phase-matching of the two cascading steps ω + ω → 2ω and 2ω + ω → 3ω. The phase-matching was achieved at the fundamental wavelength λω = 1587 nm when the QPPKTP crystal was heated to 95°C. The energy conversion efficiency reached 40% in the picosecond regime for a fundamental energy of 20 µJ that corresponds to an intensity of 1.5 GW/cm2. It is the highest value of THG efficiency ever reported to the best of our knowledge. The modeling in the case of the depleted pump regime accurately described the experiments.

Original languageEnglish
Pages (from-to)1536-1544
Number of pages9
JournalOSA Continuum
Volume3
Issue number6
DOIs
StatePublished - 15 Jun 2020

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