A 'nonlinear critical coupling' condition and a decisive factor M bound the absolute efficiency of microresonator second-harmonic generation; a PPLN racetrack reaches 61.3% on-chip conversion efficiency.
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Toward ultimate-efficiency frequency conversion in nonlinear optical microresonators
A 'nonlinear critical coupling' condition and a decisive factor M bound the absolute efficiency of microresonator second-harmonic generation; a PPLN racetrack reaches 61.3% on-chip conversion efficiency.