Kavli Affiliate: Kerry Vahala
| First 5 Authors: Zhiquan Yuan, Jinhao Ge, Peng Liu, Bohan Li, Mingxiao Li
| Summary:
Achieving compact and efficient visible laser sources is crucial for a wide
range of applications. However traditional semiconductor laser technology faces
difficulties in producing high-brightness green light, leaving a green gap in
wavelength coverage. Second-harmonic generation (SHG) offers a promising
alternative by converting near-infrared sources to visible wavelengths with
high efficiency and spectral purity. Here, we demonstrate efficient and tunable
SHG within the green spectrum using a high-Q Si3N4 microresonator. A
space-charge grating induced by the photogalvanic effect realizes
reconfigurable grating numbers and flexible wavelength tuning. Additionally,
grating formation dynamics and competition is observed. These findings
underscore the potential of silicon nitride as a robust, integrative platform
for on-chip, tunable green light sources.
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