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(a) Spontaneous emission (Fabry–Perot device) and DFB single-mode line of structure S1 at 78 K. The inset shows an expanded view of the laser emission. (b) Luminescence-voltage characteristics of the surface emission and the single-facet emission of structure S1 at 78 K. The inset shows a schematic picture of the devices.
Normalized spectra of structure S2 (applied current: 5A) in the temperature range between −50 °C and 70 °C. The temperature tuning is .
Normalized surface beam intensity distributions in the direction of the laser ridges for structure S1 (laser length 2.55 mm, 78 K) and S2 (laser length 2.3 mm, 300 K).
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