Phase locking and spectral linewidth 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 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

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Abstract

We have studied the phase locking and spectral linewidth of an ˜2.7THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8GHz 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 10Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ˜6.3kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.

Original language	English
Article number	31115
Number of pages	3
Journal	Applied Physics Letters
Volume	89
Issue number	3
DOIs	https://doi.org/10.1063/1.2227624
Publication status	Published - 17-Jul-2006

Keywords

Modulation tuning and mode locking
Semiconductor lasers
laser diodes
HETERODYNE RECEIVER
LOCAL OSCILLATOR
BOLOMETER

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10.1063/1.2227624

Phase locking and spectral linewidth of a two-mode terahertz quantum cascade laserFinal publisher's version, 443 KBLicence: Unspecified

http://adsabs.harvard.edu/abs/2006ApPhL..89c1115B

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

abstract = "We have studied the phase locking and spectral linewidth of an ˜2.7THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8GHz 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 10Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ˜6.3kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.",

keywords = "Modulation tuning and mode locking, Semiconductor lasers, laser diodes, HETERODYNE RECEIVER, LOCAL OSCILLATOR, BOLOMETER",

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.}",

year = "2006",

month = jul,

day = "17",

doi = "10.1063/1.2227624",

language = "English",

volume = "89",

journal = "Applied Physics Letters",

issn = "0003-6951",

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TY - JOUR

T1 - Phase locking and spectral linewidth of a two-mode terahertz quantum cascade laser

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.

PY - 2006/7/17

Y1 - 2006/7/17

N2 - We have studied the phase locking and spectral linewidth of an ˜2.7THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8GHz 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 10Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ˜6.3kHz. 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 ˜2.7THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8GHz 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 10Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ˜6.3kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.

KW - Modulation tuning and mode locking

KW - Semiconductor lasers

KW - laser diodes

KW - HETERODYNE RECEIVER

KW - LOCAL OSCILLATOR

KW - BOLOMETER

U2 - 10.1063/1.2227624

DO - 10.1063/1.2227624

M3 - Article

SN - 0003-6951

VL - 89

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 3

M1 - 31115

ER -

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

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