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In this perspective, we start by discussing emerging quantum and classical photonic applications from the standpoint of operating wavelength and timescale, highlighting the technological gaps that persist in current integrated photonic light sources. Next, we introduce the unique properties of lithium niobate\u2013based integrated quadratic nonlinear photonics and discuss several promising strategies that exploit this platform to realize wavelength\u2010tunable continuous wave light sources and broadband, ultrashort light pulse generation. We also assess their advantages and limitations while discussing potential solutions. 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