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1.A. Bismuto, Y. Bidaux, C. Tardy, R. Terazzi, T. Gresch, J. Wolf, S. Blaser, A. Muller, and J. Faist, “Extended tuning of mid-ir quantum cascade lasers using integrated resistive heaters,” Optics Express 23, 29715 (2015).
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4.Y. Bidaux, A. Bismuto, C. Tardy, R. Terazzi, T. Gresch, S. Blaser, A. Muller, and J. Faist, “Extended and quasi-continuous tuning of quantum cascade lasers using superstructure gratings and integrated heaters,” Applied Physics Letters 107, 221108 (2015).
5.T. Tsai and G. Wysocki, “External-cavity quantum cascade lasers with fast wavelength scanning,” Applied Physics B 100, 243 (2010).
6.J. Grahmann, A. Merten, A. Herrmann, R. Ostendorf, D. Bleh, C. Drabe, and J. Kamenz, “Large MOEMS Diffraction Grating Results Providing an EC-QCL Wavelength Scan of 20%,” Proc SPIE 9375, 93750W (2015).
7.A. Lyakh, R. Barron-Jimenez, I. Dunayevskiy, R. Go, and C. Kumar N. Patel, “External-cavity quantum cascade lasers with ultra rapid acousto-optic tuning,” Applied Physics Letters 106, 141101 (2015).
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9.W. Streifer and J. R. Whinnery, “Analysis of a dye laser tuned by acousto-optic filter,” Applied Physics Letters 17, 335 (1970).

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Operation of continuous wavequantum cascade lasers with a frequency-shifted feedback provided by an acousto-opticmodulator is reported. Measured linewidth of 1.7 cm−1 for these devices, under CW operating conditions, was in a good agreement with predictions of a model based on frequency-shifted feedback seeded by spontaneous emission.Linewidth broadening was observed for short sweep times, consistent with sound wavegrating period variation across the illuminated area on the acousto-opticmodulator. Standoff detection capability of the AOM-based QCL setup was demonstrated for several solid materials.


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