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Fig. 5 | Nanoscale Research Letters

Fig. 5

From: Demonstration of High-Power and Stable Single-Mode in a Quantum Cascade Laser Using Buried Sampled Grating

Fig. 5

a Single-mode CW emission spectra of a sampled grating DFB QCL with the cavity length of 4 mm at currents of about 1.1 × Ith for different heat sink temperatures of 15–70 °C. The inset shows CW emission spectra at different injection currents from 0.63 to 1.08 A with a step of 0.05 A at 20 °C. b CW light–current–voltage (L–I–V) characteristics of sampled grating DFB QCL with the cavity length of 4 mm at different temperatures

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