Fig. 8: The experitental results of the optically and thermally optimized QCL. | Light: Science & Applications

Fig. 8: The experitental results of the optically and thermally optimized QCL.

From: High-power, high-wall-plug-efficiency quantum cascade lasers with high-brightness in continuous wave operation at 3–300μm

Fig. 8

a The LIV curves and extracted WPE for a 5 mm long, 17 μm wide laser working in pulsed mode. Inset: the spectrum of the laser emission at 2.5 kA/cm2. b The LIV curves and (c) extracted WPE of the HRAR coated, buried ridge QCL with 8-μm ridge width and 5 mm cavity length in CW operation at 20 °C. d The LIV curve and the WPE of the buried laser with 50 QCL-stages as a function of current. Inset: the spectrum of the laser emission at 1.6 A. This testing was conducted in pulsed mode with a pulse width of 500 ns and a duty cycle of 2%

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