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Impact of Wavelength Detuning on the Performance of Mid-IR Distributed Feedback Quantum Cascade Lasers

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8 Author(s)
Feng Xie ; Corning, Inc., Corning, NY, USA ; Caneau, C. ; Leblanc, H.P. ; Coleman, S.
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We present the design and the performance of mid-infrared distributed feedback quantum cascade lasers made of strain-balanced GaxIn1-xAs/AlyIn1-yAs material on InP substrates for wavelength near 5 μm. By changing the grating period within one wafer, we demonstrated wide wavelength coverage of 325 and 282 cm-1 (16.3% and 14.1% of the center wavelength) under room temperature pulsed and continuous wave (CW) operation, respectively. The variation of pulsed and CW laser performance as a function of wavelength detuning from the gain peak was studied and correlated to the amplified spontaneous emission spectra. We conclude that a slight positive detuning within 5% of the center wavelength favors CW performance especially for high-temperature operation.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:19 ,  Issue: 4 )