Analysis of self-mixing in THz quantum cascade lasers under varying mode dynamics and external optical feedback.
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| Title: | Analysis of self-mixing in THz quantum cascade lasers under varying mode dynamics and external optical feedback. |
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| Authors: | Stanojević, Novak1,2 (AUTHOR) novakstanojevic1@gmail.com, Vuković, Nikola1 (AUTHOR) nvukovic@etf.bg.ac.rs, Ignjatović, Milan1 (AUTHOR) ignjatovic@etf.bg.ac.rs, Basta, Nikola1 (AUTHOR) nbasta@etf.bg.ac.rs, Radovanović, Jelena1 (AUTHOR) radovanovic@etf.bg.ac.rs |
| Source: | Applied Physics B: Lasers & Optics. Jun2026, Vol. 132 Issue 6, p1-17. 17p. |
| Subjects: | Quantum cascade lasers, Optical feedback, Laser beams, Terahertz spectroscopy |
| Abstract: | In this work, a set of effective semiconductor Maxwell–Bloch equations has been used to study the dynamics of a bound-to-continuum terahertz quantum cascade laser (QCL) under external optical feedback at both threshold and maximum operating currents. The used model is extended to include current-dependent input parameters obtained from density matrix transport simulations, enhancing physical accuracy and enabling device-specific modelling within the relevant current range for a specific fabricated QCL. Near threshold, external feedback shifts the emission from single-mode to multimode and, depending on the external cavity length, can produce different dynamical regimes. The feedback-induced reduction of the threshold current is demonstrated and quantified. At maximum operating current, the laser is inherently multimode, with external feedback producing different dynamical regimes. The model predicts high sensitivity of output power to variations in the external cavity. When operating with a few modes, the output remains interpretable for sensing applications, whereas highly multimode emission leads to noisy, less interpretable signals. This framework provides insight into self-mixing and mode competition phenomena, aiding in the identification of QCL designs that minimise multimode behaviour for reliable THz sensing and has a direct impact on the advancement of QCL-based sensing and communication applications. [ABSTRACT FROM AUTHOR] |
| Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 194893668 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Analysis of self-mixing in THz quantum cascade lasers under varying mode dynamics and external optical feedback. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Stanojević%2C+Novak%22">Stanojević, Novak</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> novakstanojevic1@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Vuković%2C+Nikola%22">Vuković, Nikola</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> nvukovic@etf.bg.ac.rs</i><br /><searchLink fieldCode="AR" term="%22Ignjatović%2C+Milan%22">Ignjatović, Milan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ignjatovic@etf.bg.ac.rs</i><br /><searchLink fieldCode="AR" term="%22Basta%2C+Nikola%22">Basta, Nikola</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> nbasta@etf.bg.ac.rs</i><br /><searchLink fieldCode="AR" term="%22Radovanović%2C+Jelena%22">Radovanović, Jelena</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> radovanovic@etf.bg.ac.rs</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Applied+Physics+B%3A+Lasers+%26+Optics%22">Applied Physics B: Lasers & Optics</searchLink>. Jun2026, Vol. 132 Issue 6, p1-17. 17p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Quantum+cascade+lasers%22">Quantum cascade lasers</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+feedback%22">Optical feedback</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+beams%22">Laser beams</searchLink><br /><searchLink fieldCode="DE" term="%22Terahertz+spectroscopy%22">Terahertz spectroscopy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In this work, a set of effective semiconductor Maxwell–Bloch equations has been used to study the dynamics of a bound-to-continuum terahertz quantum cascade laser (QCL) under external optical feedback at both threshold and maximum operating currents. The used model is extended to include current-dependent input parameters obtained from density matrix transport simulations, enhancing physical accuracy and enabling device-specific modelling within the relevant current range for a specific fabricated QCL. Near threshold, external feedback shifts the emission from single-mode to multimode and, depending on the external cavity length, can produce different dynamical regimes. The feedback-induced reduction of the threshold current is demonstrated and quantified. At maximum operating current, the laser is inherently multimode, with external feedback producing different dynamical regimes. The model predicts high sensitivity of output power to variations in the external cavity. When operating with a few modes, the output remains interpretable for sensing applications, whereas highly multimode emission leads to noisy, less interpretable signals. This framework provides insight into self-mixing and mode competition phenomena, aiding in the identification of QCL designs that minimise multimode behaviour for reliable THz sensing and has a direct impact on the advancement of QCL-based sensing and communication applications. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00340-026-08682-5 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 17 StartPage: 1 Subjects: – SubjectFull: Quantum cascade lasers Type: general – SubjectFull: Optical feedback Type: general – SubjectFull: Laser beams Type: general – SubjectFull: Terahertz spectroscopy Type: general Titles: – TitleFull: Analysis of self-mixing in THz quantum cascade lasers under varying mode dynamics and external optical feedback. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Stanojević, Novak – PersonEntity: Name: NameFull: Vuković, Nikola – PersonEntity: Name: NameFull: Ignjatović, Milan – PersonEntity: Name: NameFull: Basta, Nikola – PersonEntity: Name: NameFull: Radovanović, Jelena IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 09462171 Numbering: – Type: volume Value: 132 – Type: issue Value: 6 Titles: – TitleFull: Applied Physics B: Lasers & Optics Type: main |
| ResultId | 1 |
