Second harmonic generation in surface periodically-poled lithium niobate waveguides: on the role of multiphoton absorption
M. Cherchi, S. Stivala, A. Pasquazi, A. C. Busacca, S. Riva, Sanseverino, A. C. Cino, L. Colace, G. Assanto
TL;DR
This paper investigates second harmonic generation in surface periodically-poled lithium niobate waveguides, focusing on how multiphoton absorption affects conversion efficiency at high powers, and identifies the dominant three-photon process.
Contribution
It introduces an analysis of multiphoton absorption effects in surface periodically-poled lithium niobate waveguides during second harmonic generation.
Findings
Multiphoton absorption reduces conversion efficiency at high powers.
Two-color multiphoton absorption processes are significant.
Three-photon absorption is identified as the dominant process.
Abstract
Second harmonic generation is investigated in lithium niobate channels realized by proton exchange and quasi-phase-matched by surface periodic-poling. The reduction in conversion efficiency at high powers is interpreted in terms of multi-photon absorption via two-color terms, yielding an estimate of the dominating three-photon process.
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