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The engineering of the etched 1D PhC cavity sidewalls angle allows for high Q-factors over a variety of upper cladding styles, as well as the development of the highest reported Q-factor for non-suspended asymmetric SiN PhC structures. We describe the usage of these SiN PhC cavities in hybrid external cavity laser assembly, with mode-hop free single mode laser operation over a wide range of injectable currents, milliwatts of power output, and side-mode suppression ratios in the range of 40 dB. We also discuss the possibility of using these systems as novel transducers for refractive index shifts caused by analyte specific absorption of infrared radiation by the target analytes present in liquid or liquid phase.
Source link: https://doi.org/10.1515/nanoph-2022-0245
Widely tunable, narrowly linewidth external cavity lasers on silicon substrates have many common uses, including white-light measurement, wavelength division multiplexing systems, coherent optical communication, and optical fiber sensor technology. Two main device-integrated systems for obtaining highly tunable, narrow linewidth external cavity lasers on silicon substrates are discussed and compared in detail, including MRR-integrated structure and MRR-and-MZI-integrated structure of external cavity semiconductor lasers.
Source link: https://doi.org/10.3390/cryst12050674
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