Generating laser light in the green spectrum has traditionally been challenging due to the limitations of conventional laser designs. This spectral region, known as the green gap, lies between the more easily achievable red and blue wavelengths. A recent study presents a groundbreaking technique for overcoming this hurdle. Researchers have successfully employed Kerr optical parametric oscillation, i.e., Kerr OPO within silicon nitride microrings, to generate light across the green gap.
The core of this innovation lies in the partial undercutting of the microrings, meticulously engineered to manipulate their dispersion properties. This tailored design empowers the microrings to efficiently produce a broad spectrum of light encompassing the green wavelengths. The researchers achieved remarkable results, generating over 150 wavelengths within the green gap.
Furthermore, the study demonstrates the capability for continuous frequency tuning and generation of light with narrow optical line widths. These features hold significant value for applications requiring coherent light sources.
This breakthrough paves the way for developing novel green lasers with superior performance. Green lasers hold immense potential in various fields, including underwater communications, high-resolution displays, and medical procedures. The ability to efficiently generate green light using Kerr OPO in silicon nitride microrings opens doors for exciting advancements in these areas and beyond.
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