Abstract

We report an experimental study of terahertz (THz) quantum cascade lasers (QCLs) exploiting an intra-cavity self-detection process, where we demonstrate the generation of trains of self-mode-locked pulses. The detection technique is based on a well-known property of these devices, namely the fact that their gain dynamics unfolds on an ultra-fast time scale, in the order of tens of ps (for THz QCLs), determined by intersubband relaxation [1]. The resulting modulation of the population inversion can therefore be observed as a function of time over very large bandwidths, in the ~10-100GHz range, simply by monitoring the QCL current [2]. To fully exploit this possibility, in this work we processed an exceptionally long single-plasmon ridge waveguide of 15mm, based on an ultra-low threshold, 4.2THz active-region design [3,4].

© 2019 IEEE

PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription