Active fiber-ring enhanced absorption gas spectroscopy using multi-longitudinal mode tunable laser in the NIR

Mahmoud A. Selim; Yasser M. Sabry; George A. Adib; Diaa Khalil

doi:10.1117/12.2508406

4 March 2019 Active fiber-ring enhanced absorption gas spectroscopy using multi-longitudinal mode tunable laser in the NIR

Mahmoud A. Selim, Yasser M. Sabry, George A. Adib, Diaa Khalil

Author Affiliations +

Proceedings Volume 10925, Photonic Instrumentation Engineering VI; 1092508 (2019) https://doi.org/10.1117/12.2508406
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

In this work, we report the usage of multi-longitudinal mode laser as an input source to achieve a larger enhancement in the interaction length in cavity enhanced absorption spectroscopy. The MM laser source is constructed in the form of a ring laser using a long fiber coil, a directional coupler, a tunable filter with FWHM of 1 nm and a semiconductor optical amplifier pumped above the laser threshold. The ring has a length of about 1004 m with an FSR of 199.2 kHz. The gas cell is inserted into another ring cavity, which consists of two directional couplers and a gain medium pumped below threshold. The gain medium is used to compensate for the losses and boost the ring cavity finesse. The cavity ring has a length of about 6 m which gives an FSR of 33.3 MHz. The large ratio between the lengths of the two cavities (the MM laser cavity and the gas cell ring cavity) eliminates the need for a mode-locked technique. The acetylene gas cell is measured around 1535 nm. The interaction length is improved by a factor of about 37 compared to the direct absorption of the gas cell.

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Citation Download Citation

Mahmoud A. Selim, Yasser M. Sabry, George A. Adib, and Diaa Khalil "Active fiber-ring enhanced absorption gas spectroscopy using multi-longitudinal mode tunable laser in the NIR", Proc. SPIE 10925, Photonic Instrumentation Engineering VI, 1092508 (4 March 2019); https://doi.org/10.1117/12.2508406

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