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

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

doi:10.1021/acsphotonics.4c00608

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

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

Associate Professorship of Computational Photonics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	4515-4523
Number of pages	9
Journal	ACS Photonics
Volume	11
Issue number	11
DOIs	https://doi.org/10.1021/acsphotonics.4c00608
State	Published - 20 Nov 2024

Keywords

VECSEL
frequency comb
injection locking
metasurface
quantum-cascade laser
terahertz

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10.1021/acsphotonics.4c00608

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title = "Harmonic and Subharmonic RF Injection Locking of THz Metasurface Quantum-Cascade VECSEL",

abstract = "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.",

keywords = "VECSEL, frequency comb, injection locking, metasurface, quantum-cascade laser, terahertz",

author = "Yu Wu and Schreiber, {Michael A.} and Kim, {Anthony D.} and Addamane, {Sadhvikas J.} and Christian Jirauschek and Williams, {Benjamin S.}",

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T1 - Harmonic and Subharmonic RF Injection Locking of THz Metasurface Quantum-Cascade VECSEL

AU - Wu, Yu

AU - Schreiber, Michael A.

AU - Kim, Anthony D.

AU - Addamane, Sadhvikas J.

AU - Jirauschek, Christian

AU - Williams, Benjamin S.

PY - 2024/11/20

Y1 - 2024/11/20

N2 - 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.

AB - 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.

KW - VECSEL

KW - frequency comb

KW - injection locking

KW - metasurface

KW - quantum-cascade laser

KW - terahertz

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JO - ACS Photonics

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

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