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(Color online) (a) Conduction band diagram of the active region of the QC laser designed for emission at . The solid curves represent the moduli squared of the relevant electron wave functions. (b) Portion of the band diagram showing position of the valley (L) and associated electron wave functions calculated using a separation value of and the electron effective mass of (Ref. 9).
Light-current characteristics of -long lasers with different ridge widths at and voltage-current characteristics of the -wide QCL at (solid curve) and (dotted curve). The lasers were driven with pulses at a repetition rate of . The inset shows an emission spectrum at .
Threshold current density vs heat sink temperature for -wide, -long HR-coated (closed circles) and uncoated (open circles) QCLs measured in pulsed mode (, ) and the waveguide loss calculated from comparison of these data. The inset shows an emission spectrum of a HR-coated laser recorded at (, ).
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