Harmonic and Subharmonic RF Injection Locking of THz Metasurface Quantum-Cascade VECSEL

Wu, Yu; Schreiber, Michael A.; Kim, Anthony D.; Addamane, Sadhvikas J.; Jirauschek, Christian; Williams, Benjamin S.

doi:10.1021/acsphotonics.4c00608

Harmonic and Subharmonic RF Injection Locking of THz Metasurface Quantum-Cascade VECSEL

Journal Article · Wed Oct 30 00:00:00 EDT 2024 · ACS Photonics

DOI:https://doi.org/10.1021/acsphotonics.4c00608· OSTI ID:2498471

^[1]; Schreiber, Michael A. ^[2]; ^[1]; Addamane, Sadhvikas J. ^[3]; Jirauschek, Christian ^[2]; Williams, Benjamin S. ^[1]

Univ. of California, Los Angeles, CA (United States)
Technische Univ. München, Garching (Germany)
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Harmonic and subharmonic RF injection locking is demonstrated in a terahertz (THz) quantum-cascade vertical-external-cavity surface-emitting laser (QC-VECSEL). By tuning the RF injection frequency around integer multiples and submultiples of the cavity round-trip frequency, different harmonic and subharmonic orders can be excited in the same device. Modulation-dependent behavior of the device has been studied with recorded lasing spectral broadening and locking bandwidths in each case. In particular, harmonic injection locking results in the observation of harmonic spectra with bandwidths over 200 GHz. A semiclassical Maxwell-density matrix formalism has been applied to interpret QC-VECSEL dynamics, which aligns well with experimental observations.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: NA0003525

OSTI ID:: 2498471

Report Number(s):: SAND--2025-00025J

Journal Information:: ACS Photonics, Journal Name: ACS Photonics Journal Issue: 11 Vol. 11; ISSN 2330-4022

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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