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(a) Electron micrograph of the top grating (etch depth , duty-cycle 1:1). (b) Facet of a fully processed device with top grating and thick gold filling the trenches.
Electro-optic characteristic curves of (a) 2 mm and (b) 4 mm long devices for low duty-cycles of 0.25%. A single mode spectrum and the far-field intensity along the slow-axis (data points and Gaussian fit) of 2 mm long DFB-QCL are depicted in the insets.
Behavior of the average and peak output power of a 2 mm long laser with increasing PRF at constant and .
Tuning behavior of a DFB-QCL with at and . (a) Temperature tuning at (squares) and tuning induced by an increase in PRF at (triangles). (b) Tuning in dependence of a sub-threshold bias current (squares) and the concomitantly dissipated power (triangles).
Detector signal of a pulse with etalon (continuous line) and (dotted) in the beam path at and . The dash-dotted line shows the transmission according to the HITRAN database (Ref. 8).
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