Phase locking and spectral linewidth width of a two-mode terahertz quantum cascade laser

A. Baryshev; J. N. Hovenier; A. J.L. Adam; I. Kašalynas; J. R. Gao; T. O. Klaassen; B. S. Williams; S. Kumar; Q. Hu; J. L. Reno

doi:10.1063/1.2227624

Phase locking and spectral linewidth width of a two-mode terahertz quantum cascade laser

A. Baryshev^*, J. N. Hovenier, A. J.L. Adam, I. Kašalynas, J. R. Gao, T. O. Klaassen, B. S. Williams, S. Kumar, Q. Hu, J. L. Reno

^*Corresponding author for this work

ImPhys/Adam group

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

Abstract

We have studied the phase locking and spectral linewidth of an ∼2.7 THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8 GHz is compared with a microwave reference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in a narrow beat linewidth of less than 10 Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ∼6.3 kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.

Original language	English
Article number	031115
Number of pages	3
Journal	Applied Physics Letters
Volume	89
Issue number	3
DOIs	https://doi.org/10.1063/1.2227624
Publication status	Published - 2006

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Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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title = "Phase locking and spectral linewidth width of a two-mode terahertz quantum cascade laser",

abstract = "We have studied the phase locking and spectral linewidth of an ∼2.7 THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8 GHz is compared with a microwave reference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in a narrow beat linewidth of less than 10 Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ∼6.3 kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.",

author = "A. Baryshev and Hovenier, {J. N.} and Adam, {A. J.L.} and I. Ka{\v s}alynas and Gao, {J. R.} and Klaassen, {T. O.} and Williams, {B. S.} and S. Kumar and Q. Hu and Reno, {J. L.}",

note = "Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.",

year = "2006",

doi = "10.1063/1.2227624",

language = "English",

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AU - Baryshev, A.

AU - Hovenier, J. N.

AU - Adam, A. J.L.

AU - Kašalynas, I.

AU - Gao, J. R.

AU - Klaassen, T. O.

AU - Williams, B. S.

AU - Kumar, S.

AU - Hu, Q.

AU - Reno, J. L.

N1 - Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2006

Y1 - 2006

N2 - We have studied the phase locking and spectral linewidth of an ∼2.7 THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8 GHz is compared with a microwave reference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in a narrow beat linewidth of less than 10 Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ∼6.3 kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.

AB - We have studied the phase locking and spectral linewidth of an ∼2.7 THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8 GHz is compared with a microwave reference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in a narrow beat linewidth of less than 10 Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ∼6.3 kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.

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DO - 10.1063/1.2227624

M3 - Article

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VL - 89

JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -

Phase locking and spectral linewidth width of a two-mode terahertz quantum cascade laser

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