Theory of ${\chi }^{(2)}$-microresonator-based frequency conversion

Abstract

Microresonator-based platforms with ${\chi }^{(2)}$ nonlinearities have the potential to perform frequency conversion at high efficiencies and ultralow powers with small footprints. The standard doctrine for achieving high conversion efficiency in cavity-based devices requires "perfect matching", that is, zero phase mismatch while all relevant frequencies are precisely at a cavity resonance, which is difficult to achieve in integrated platforms due to fabrication errors and limited tunabilities. In this Letter, we show that the violation of perfect matching does not necessitate a reduction in conversion efficiency. On the contrary, in many cases, mismatches should be intentionally introduced to improve the efficiency or tunability of conversion. We identify the universal conditions for maximizing the efficiency of cavity-based frequency conversion and show a straightforward approach to fully compensate for parasitic processes such as thermorefractive and photorefractive effects that, typically, can limit the conversion efficiency. We also show rigorously that these high-efficiency states are stable.

arXiv comment16 pages, 6 figures

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Cited by in corpus (4)

• Toward ultimate-efficiency frequency conversion in nonlinear optical microresonators
• Ladder of Eckhaus instabilities and parametric conversion in chi(2) microresonators
• Telecom-to-Visible Quantum Frequency Converter on a Silicon Nitride Chip
• Dual backgrounds and their stability during ${\chi }^{(2)}$ comb generation in microresonators