Fast swept continuous wave quantum cascade laser operating in external cavity with polygon mirror

Dmitry G. Revin; Stephen J. Matcher

doi:10.1117/12.2620957

20 May 2022 Fast swept continuous wave quantum cascade laser operating in external cavity with polygon mirror

Dmitry G. Revin, Stephen J. Matcher

Proceedings Volume 12141, Semiconductor Lasers and Laser Dynamics X; 1214109 (2022) https://doi.org/10.1117/12.2620957
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

We report a continuous wave room temperature quantum cascade laser operating in an external cavity in the Littrow configuration with a 10-facet polygon mirror rotating at 24,000 RPM. The quantum cascade laser emission is swept across ∼1520 – 1625 cm-1 wavenumber range in less than ~45 µs with a sweep repetition rate of 4 kHz. The measured maximum output power at the laser gain maximum, 15°C and 0.86 A driving current is ~90 mW; the estimated average output power across the 45 µs wavenumber sweep is ~50 mW. Through its sweep, the laser emits on the sequential Fabry-Perot longitudinal modes of the laser chip cavity with the mode separation of ~0.5 cm-1 . The linewidth of the emitting modes is less than ~0.15 cm-1 . Spectral measurements of the infrared absorption features of a 10 µm thick layer of acetophenone and water vapor in the air have demonstrated the capability of obtaining spectral data in less than 45 μs.

Conference Presentation

Citation Download Citation

Dmitry G. Revin and Stephen J. Matcher "Fast swept continuous wave quantum cascade laser operating in external cavity with polygon mirror", Proc. SPIE 12141, Semiconductor Lasers and Laser Dynamics X, 1214109 (20 May 2022); https://doi.org/10.1117/12.2620957

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