Grier, Andrew and Dean, Paul and Valavanis, Alexander and Kundu, Iman and Cooper, Jonathan D. and Agnew, Gary and Taimre, Thomas and Lim, Yah Leng and Bertling, Karl and Rakić, Aleksandar D. and Harrison, Paul and Linfield, Edmund and Ikonić, Zoran and Davies, A. Giles and Indjin, Dragan (2016). Data associated with 'Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers'. University of Leeds. https://doi.org/10.5518/77
Summary
We explain the origin of voltage variations due to self-mixing in a terahertz (THz) frequency quantum cascade laser (QCL) using an extended density matrix (DM) approach. Our DM model includes a full calculation of scattering between quantum states as well as coherent transport from miniband states into the upper lasing level and allows calculation of both the current–voltage (I-V) and optical power characteristics of the QCL under optical feedback. The model is applied to an exemplar 2.6 THz bound-to continuum QCL that is typical of those used in optical feedback interferometry. Feedback from an external cavity is included in the model through a change in cavity loss, to which the gain of the active region is clamped. The variation of intra-cavity field strength necessary to achieve gain clamping, and the subsequent change in bias required to maintain a constant current density through the heterostructure is then calculated. Strong enhancement of the self-mixing voltage signal due to non-linearity of the I–V characteristics in the analyzed THz QCL device is predicted and confirmed experimentally.
Keywords: | Terminal voltage variations | ||||||
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Academic units: | Faculty of Science, Technology and Arts (STA) > Academic Departments > Department of Engineering and Mathematics | ||||||
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Publisher of the data: | University of Leeds | ||||||
Publication date: | 25 August 2016 | ||||||
Data last accessed: | No data downloaded yet | ||||||
URL of the data (if published elsewhere): | https://doi.org/10.5518/77 | ||||||
SHURDA URI: | https://shurda.shu.ac.uk/id/eprint/251 | ||||||
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Data may be available from external sources: https://doi.org/10.5518/77