Broadband quasi-phase-matching in dispersion-engineered all-optically poled silicon nitride waveguides  

作　　者：EDGARS NITISS BORIS ZABELICH OZAN YAKAR JUNQIU LIU RUI NING WANG TOBIAS J.KIPPENBERG AND CAMILLE-SOPHIE BRÈS 

机构地区：[1]Ecole Polytechnique Fédérale de Lausanne(EPFL),Photonic Systems Laboratory(PHOSL),STI-IEL,Station 11,CH-1015 Lausanne,Switzerland [2]Ecole Polytechnique Fédérale de Lausanne(EPFL),Laboratory of Photonics and Quantum Measurements(LPQM),SB-IPHYS,Station 3,CH-1015 Lausanne,Switzerland

出　　处：《Photonics Research》2020年第9期1475-1483,共9页光子学研究（英文版）

基　　金：Schweizerischer Nationalfonds zur Forderung der Wissenschaftlichen Forschung(176563)(BRIDGE);U.S.Air Force(FA9550-19-1-0250);Defense Advanced Research Projects Agency(HR0011-15-C-055)(DODOS);European Research Council(ERC-2017-CoG 771647)(PISSARRO);Microsystems Technology Office(MTO);Air Force Material Command;Air Force Office of Scientific Research;EPFL Center of MicroNanoTechnology(CMi)。

摘　　要：Quasi-phase-matching(QPM)has become one of the most common approaches for increasing the efficiency of nonlinear three-wave mixing processes in integrated photonic circuits.Here,we provide a study of dispersion engineering of QPM second-harmonic(SH)generation in stoichiometric silicon nitride(Si3 N4)waveguides.We apply waveguide design and lithographic control in combination with the all-optical poling technique to study the QPM properties and shape the waveguide dispersion for broadband spectral conversion efficiency inside Si3 N4 waveguides.By meeting the requirements for maximal bandwidth of the conversion efficiency spectrum,we demonstrate that group-velocity matching of the pump and SH is simultaneously satisfied,resulting in efficient SH generation from ultrashort optical pulses.The latter is employed for retrieving a carrier-envelope-offset frequency of a frequency comb by using an f-2 f interferometric technique,where supercontinuum and SH of a femtosecond pulse are generated in Si3N4 waveguides.Finally,we show that the waveguide dispersion determines the QPM wavelength variation magnitude and sign due to the thermo-optic effect.

关 键 词：WAVEGUIDE WAVEGUIDES PUMP 

分 类 号：TN25[电子电信—物理电子学]