Towards active mode locking in terahertz metasurface quantum-cascade lasers

Benjamin S. Williams

doi:10.1117/12.2649207

24 March 2023 Towards active mode locking in terahertz metasurface quantum-cascade lasers

Benjamin S. Williams

Author Affiliations +

Proceedings Volume PC12419, Ultrafast Phenomena and Nanophotonics XXVII; PC1241901 (2023) https://doi.org/10.1117/12.2649207
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Progress towards broadband active mode-locked operation of terahertz metasurface Quantum-Cascade (QC) Vertical External Cavity Surface Emitting Lasers (VECSELs) is presented. First we show that broadband gain over a 1.1 THz bandwidth (centered at 3.5 THz) can be obtained from coupled-resonator QC amplifying metasurfaces. Second we show multi-mode operation can be encouraged by using a specially designed output coupler to compensate for the frequency dependent metasurface gain. Third, we show that injecting a strong RF tone onto the laser bias current at a frequency near the cavity round trip frequency induces multimode lasing over a 290 GHz bandwidth and stabilizes the round-trip frequency.

Conference Presentation

Citation Download Citation

Benjamin S. Williams "Towards active mode locking in terahertz metasurface quantum-cascade lasers", Proc. SPIE PC12419, Ultrafast Phenomena and Nanophotonics XXVII, PC1241901 (24 March 2023); https://doi.org/10.1117/12.2649207

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