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20 August 2020 External cavity lasers based on SiN platform for biomedical applications
G. C. R. Devarapu, S. Konugolu Venkata Sekar, S. Andersson-Engels, L. O’Faolain
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Proceedings Volume 11461, Active Photonic Platforms XII; 114611O (2020) https://doi.org/10.1117/12.2567921
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
In this article, we present experimental and simulation results of a novel dual-wavelength laser source that emits in the regime of 764nm and 820nm. These wavelength regimes are chosen to match the absorption lines of oxygen gas and water vapour. The dual-wavelength laser source is realised by combining two External Cavity (EC) lasers on a SiN platform. In particular, each of these EC lasers is formed by butt-coupling a SiN resonant mirror to a reflecting semiconductor gain chip that results in highly monochromatic source (10MHz) to match the narrow absorption lines of the gases. Ultimately, this SiN based dual-wavelength source will have applications in the field of biomedical for continuous monitoring of oxygen in body cavities.
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G. C. R. Devarapu, S. Konugolu Venkata Sekar, S. Andersson-Engels, and L. O’Faolain "External cavity lasers based on SiN platform for biomedical applications", Proc. SPIE 11461, Active Photonic Platforms XII, 114611O (20 August 2020); https://doi.org/10.1117/12.2567921
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KEYWORDS
Biomedical optics
Laser applications
Absorption
Laser sources
Oxygen
Gases
Mirrors
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