Swiss researchers used state of the art fabrication facilities to miniaturize erbium lasers on to a silicon chip without impacting performance.
Researchers at the École Polytechnique Fédérale de Lausanne in Switzerland have developed the world’s first chip-integrated laser that matches the performance of conventional fiber-based lasers. This achievement could help develop smaller, more portable, cost-effective lasers for various fields.
The researchers used a state-of-the-art fabrication process to achieve this and began constructing a meter-long on-chip optical cavity on a silicon nitride photonic circuit. An optical cavity is a set of mirrors that provides optical feedback. When tested, the researchers confirmed that their laser beam generated a power output of 10 mW and had a side suppression ratio greater than 70 dB. This is far superior to conventional laser systems.
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