Continuous-wave distributed Bragg reflector quantum cascade lasers with fine single-mode tuning up to 102 °C at [formula omitted]m.

We have demonstrated an 8. 4 μ m stable single-mode quantum cascade laser using a two-section distributed Bragg reflector design. Output power of 252 mW, a threshold current density of 1.04 kA/cm 2 , and a characteristic temperature of 206 K were achieved during continuous-wave operation at room temperature. Robust single-mode emissions with all side-mode suppression ratios exceeding 25 dB were obtained at injection currents ranging from 420 mA to 900 mA and heat-sink temperatures ranging from 10 °C to 102 °C. Benefiting from the physical isolation of the two sections and from being mounted epilayer-side down on patterned submounts, the tiny tuning coefficients of the device are −0.003014 cm − 1 mA − 1 and −0.0762 cm − 1 K − 1. This type of single-mode quantum cascade laser with fine tuning characteristics is required to perform accurate detection of trace gases. • Stable single-mode DBR in long-wave IR band (8–12 μ m) is realized. • The fine tuning property with the tiny tuning coefficients is conducive to the resolution and detection of dense gas absorption lines. • The device can work above 100 ℃ under CW operation and has ideal current characteristics such as low threshold, large dynamic range, which are beneficial for practical applications. [ABSTRACT FROM AUTHOR]