Second-harmonic flat-top beam shaping via a three-dimensional nonlinear photonic crystal
摘要
WeexperimentallyextendthenonlinearGaussiantofat-topbeamshapingfromonetotwodimensionsthroughathree-dimensionalnonlinearphotoniccrystal.Employinganear-infraredfemtosecondlaser,weinduceamodifcationinsidelithiumniobatetoachieveasecond-ordernonlin-earopticalcoefcientmodulationinthreedimensions.Thefat-toppedtruncationofwavefronthasbeenadjustedinamutualperpendicularcoordinateseparately.Amongthegeneratedfat-toppedbeams,theoptimalfatnessis97.1%,andthenonlinearconversionefciencyis10 atthepeakpowerof37kWwiththeinteractionlengthof630 µm.Byaddinganextradimension,ourworksimultaneouslyenablesfull-wavefrontfat-topdistributionandnonlinearfrequencyconversion.
类型
出版物
Optics Letters
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