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We report on second harmonic generation(SHG) in on-chip high-Q(>105) lithium niobate(Li Nb O3, LN) microresonators fabricated by femtosecond laser micromachining. We examine the efficiency of SHG with either a continuous-wave(CW) or an ultrashort pulsed pump laser. The normalized conversion efficiencies of SHG obtained with the CW and pulsed pump lasers are measured to be 1.35×10?5 m W?1 and 2.30×10?6 m W?1, respectively.
We report on second harmonic generation (SHG) in on-chip high-Q (> 105) lithium niobate (Li Nb O3, LN) microresonators fabricated by femtosecond laser micromachining. We examine the efficiency of SHG with either a continuous-wave ) or an ultrashort pulsed pump laser. The normalized conversion efficiencies of SHG obtained with CW and pulsed pump lasers are measured to be 1.35 × 10? 5 mW? 1 and 2.30 × 10? 6 mW? 1, respectively.