Abstract
Stable single mode operation of distributed feedback quantum cascade lasers operating in room-temperature continuous-wave mode is reported. Feedback is provided by the second-order grating in a both index- and loss-dominated coupling scheme. Reliable single mode emission at λ∼4.7μm with a side-mode suppression ratio ∼30dB is observed. A linear tuning of wavelength with heat-sink temperature or injection current indicates the stable single mode operation without mode hopping.
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