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Second-harmonic generation (SHG) plays a significant role in modern photonic technology. Integrated photonic resonators fabricated with thin-film lithium niobate can achieve ultrahigh efficiencies by combining small mode volumes with high material nonlinearity. Cavity-enhanced SHG requires accurate phase and frequency matching conditions, where fundamental and second-harmonic wavelengths are both on resonance. However, this double-resonance condition can typically be realized only at a fixed random wavelength due to the high sensitivity of photonic resonances to the device geometry and fabrication variations. Here, we propose a novel method that can achieve the double-resonance condition over a large wavelength range. We combine thermal-optic and electro-optic (EO) effects to realize the separate tuning of fundamental and second-harmonic resonances. We demonstrated that the optimum SHG efficiency can be maintained over a wavelength range that exceeds the limit achievable with only thermal tuning. With this flexible tuning capability, we further show the precise alignment of SHG wavelengths of two separate thin-film lithium niobate resonators without sacrificing efficiencies.
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Preparation-free resonator array atomic memory for on-chip quantum storage
We propose a light storage technique utilizing an array of photonic resonators that mimic atomic frequency comb memory. This method can be implemented on a solid-state photonic chip without requiring spectral hole burning. By eliminating the need for long preparation cycles and leveraging tunable photonic resonances, this approach offers high bandwidth, high efficiency, and a fast duty cycle simultaneously and without compromise.
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- Award ID(s):
- 2410054
- PAR ID:
- 10598576
- Publisher / Repository:
- American Institute of Physics
- Date Published:
- Journal Name:
- APL Quantum
- Volume:
- 2
- Issue:
- 2
- ISSN:
- 2835-0103
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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