This study investigates limitations of high power single-pass 399 nm light generations in periodically poled 5 mol% MgO doped lithium niobate (PPMgLN) waveguides arising from optical absorptions and the resulting thermal loading. A coupled thermo-optical model was employed to simulate 399 nm light generation process. It was found that after optimizing the waveguide length and the operating temperature, the output power of 0.393 W with almost no thermal inhibition can be achieved, which corresponds to a conversion efficiency of 78.6 %. It is expected that a compact and efficient high power 399 nm lasers can be realized by second harmonic generation in PPMgLN waveguides.

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