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Figure 4 | Nanoscale Research Letters

Figure 4

From: 10-W pulsed operation of substrate emitting photonic-crystal quantum cascade laser with very small divergence

Figure 4

Power versus current (L-I) characterization of a 4-mm-long CRPC substrate emitting QCL. With a ridge width of 390 μm at different heat sink temperatures between 10°C and 50°C. The inset shows the semilog plot of single-mode emission spectra at an injection current of 1.1Ith under pulsed mode operation, and a SMSR of 30 dB is maintained for the entire temperature range of 15°C to 65°C. Device edge facets were high-reflective coated, and substrate facets were anti-reflective coated.

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