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In this paper, an external cavity diode laser (ECDL) in Littrow configuration with narrowband emission is presented. The laser system is based on a commercially available GaN Fabry-Perot laser diode. Longitudinal mode selection is performed using a reflective holographic grating. Tuning range over 3.4 nm is achieved with a short linewidth of 0.02 nm at the rated current. The ECDL system is integrated into an optical sensor for remote detection of Nitrogen Dioxide (NO2) gas.
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Khaled Gasmi, Abdulaziz AlJalal, Watheq Al-Basheer, "Optical sensor for NO2 gas detection using an external cavity diode laser," Proc. SPIE 12572, Optical Sensors 2023, 1257214 (31 May 2023); https://doi.org/10.1117/12.2665254