Gain recovery dynamics of a terahertz quantum cascade laser

Richard P. Green, Alessandro Tredicucci, Ngui Q. Vinh, Ben Murdin, Carl Pidgeon, Harvey E. Beere, David A. Ritchie

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27 Citations (Scopus)


The gain recovery time of a bound-to-continuum terahertz quantum cascade laser is measured using a stimulated emission photocurrent technique. At low temperatures a value ~50 ps is found. This tends to decrease with rising temperature, and suggests that class B laser dynamics should be expected from these devices. Both the value and the trend in the gain recovery time are found to be consistent with hopping transport through the miniband. Power-dependent measurements of the photocurrent clearly show the effects of inhomogeneous broadening of the gain transition. © 2009 The American Physical Society.

Original languageEnglish
Article number075303
JournalPhysical Review B: Condensed Matter and Materials Physics
Issue number7
Publication statusPublished - 7 Aug 2009


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