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The temperature dependence of for the long cavity device. The inset shows a typical LI characteristic (solid line) and the effect of a small temperature increase on the LI characteristic for absolute temperatures and (dashed lines).
Transients of the lasing output following illumination by a far-IR macropulse. The profile of the macropulse is shown as recorded by a pyrometer.
Modulation of the near-IR lasing as a function of the far-IR photon energy. The inset shows a higher resolution scan for a temperature of . The sharp feature at , superimposed on the broad dip, is attributed to atmospheric absorption.
Room temperature spontaneous emission spectrum recorded for high current injection, showing emission from both the ground and first excited state transitions. The narrower spectrum shows emission from a laser device, with lasing occurring at .
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