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. 2015 Oct 21;15(10):26743–26755. doi: 10.3390/s151026743

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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(a,c): The normalized signal amplitude as a function of the current modulation depth for NH₃ and H₂S, respectively; (b,d): Fiber-amplifier-enhanced QEPAS signal as a function of the actual laser power for NH₃ and H₂S, respectively.