High-performance visible-light lasers that fit on a fingertip

https://phys.org/news/2023-01-high-performance-visible-light-lasers-fingertip.html

"compact and tunable visible lasers... robust and versatile platform... Fabry-Perot (FP) diodes as the light sources, which minimizes the impact of the losses on the performance of the chip-scale lasers... to guide the light, they used silicon nitride, a dielectric widely used in the semiconductor industry that is transparent for visible light of all colors scalable and works for all colors of light... quantum information, atomic clocks, biosensing, underwater ranging, Li-Fi (visible light communications)"

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https://www.eurekalert.org/news-releases/1114887