Investigation of self-mixing in a THz quantum-cascade VECSEL under optical feedback

Anthony D. Kim; Daniel McGovern; Sadhvikas Addamane; Benjamin S. Williams

doi:10.1117/12.3001981

13 March 2024 Investigation of self-mixing in a THz quantum-cascade VECSEL under optical feedback

Anthony D. Kim, Daniel McGovern, Sadhvikas Addamane, Benjamin S. Williams

Proceedings Volume PC12905, Novel In-Plane Semiconductor Lasers XXIII; PC129050M (2024) https://doi.org/10.1117/12.3001981
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

The effects of optical feedback on a terahertz (THz) quantum-cascade vertical-external-cavity surface-emitting laser (QC-VECSEL) are investigated via self-mixing. A nominally single-mode 2.8 THz QC-VECSEL operating in continuous-wave is subjected to various optical feedback conditions while monitoring variations in its terminal voltage associated with self-mixing. Due to its large emitting aperture, and flat highly-reflective output coupler, the VECSEL architecture is found to be strongly susceptible to optical feedback. Regions of instability are observed, as is evidence of multiple roundtrip re-injection within the feedback cavity.

Conference Presentation

Citation Download Citation

Anthony D. Kim, Daniel McGovern, Sadhvikas Addamane, and Benjamin S. Williams "Investigation of self-mixing in a THz quantum-cascade VECSEL under optical feedback", Proc. SPIE PC12905, Novel In-Plane Semiconductor Lasers XXIII, PC129050M (13 March 2024); https://doi.org/10.1117/12.3001981

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