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Power and voltage as a function of current of a 3 mm long and wide device with a HR-coating on the back facet in pulsed operation (100 kHz, 200 ns pulse width). The inset shows the exponential dependence of the threshold current with temperature in pulsed (circles) and cw operation (full dots).
Spectrally resolved modal gain as a function of injected current between 0.3 and at 80 K (a) and between 1.1 and at 274 K heat-sink temperature (b). Baseline absorption measurements are shown as dashed lines. What appears to be an absorption at energies below 255 meV is an artifact due to electrical and optical crosstalk between sections. (c) Comparison between gain and electroluminescence (dashed) spectra at same bias at 274 K. Inset: sample geometry and terminology.
(a) Peak values of the gain as a function of injected current and for temperatures between 80 and 322 K. Dashed lines represent linear fits that yield the gain coefficient and waveguide losses that are shown in graphs (b) and (c) as a function of temperature (dots). Squares represent the corresponding values obtained by -measurements. The dashed line in (b) shows an exponential fit and the dotted line the expected dependence on temperature assuming that optical phonon scattering is the only nonradiative channel.
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