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(a) Sketch of the PCDFB lattice parameters and SEM pictures for (b) oblique view of the etched grating layer before the removal of the mask, (c) cross-section view of a corner of the cleaved facet, and (d) oblique view of the bonded laser chip.
Pulsed mode power-current-voltage characteristics of the fabricated PCDFB QCLs with a cavity length of 3 mm and a ridge width of . The testing was performed at room temperature.
Spectra of the PCDFB QCLs measured at under pulsed mode operation at room temperature.
Calculated PCDFB band structures around point in the reciprocal space. The inset shows a schematic of the primitive cell of the reciprocal lattice.
Far-field characteristics of PCDFB QCLs measured at under pulsed mode operation at room temperature.
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