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. 2010 Mar 24;10(4):2492–2510. doi: 10.3390/s100402492

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© 2010 by the authors; licensee Molecular Diversity Preservation International, 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/3.0/).

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Figure 8. — Intra-pulse tuning of a DFB QCL emitting at 11.43 μm driven with 250 ns pulses at room temperature. The black line shows the raw pulse shape. A measurement using an etalon (green line) with a free spectral region (FSR) of 0.049 cm⁻¹ indicates a chirp-rate of 0.382 cm⁻¹ /100 ns. An absorption experiment (red line) allows for precise determination of the wavelength axis using well known absorption lines of C₂H₄.