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  • Title: High-efficiency second harmonic generation of blue light on thin-film lithium niobate.
    Author: Park T, Stokowski HS, Ansari V, McKenna TP, Hwang AY, Fejer MM, Safavi-Naeini AH.
    Journal: Opt Lett; 2022 Jun 01; 47(11):2706-2709. PubMed ID: 35648910.
    Abstract:
    The strength of interactions between photons in a χ(2) nonlinear optical waveguide increases at shorter wavelengths. These larger interactions enable coherent spectral translation and light generation at a lower power, over a broader bandwidth, and in a smaller device: all of which open the door to new technologies spanning fields from classical to quantum optics. Stronger interactions may also grant access to new regimes of quantum optics to be explored at the few-photon level. One promising platform that could enable these advances is thin-film lithium niobate (TFLN), due to its broad optical transparency window and possibility for quasi-phase matching and dispersion engineering. In this Letter, we demonstrate second harmonic generation of blue light on an integrated thin-film lithium niobate waveguide and observe a conversion efficiency of η0 = 33, 000%/W-cm2, significantly exceeding previous demonstrations.
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