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Continuous wave operation of quantum cascade lasers with frequency-shifted feedback
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).
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).
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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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