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

Journal article (2006)
Department
Kavli Institute of Nanoscience (AS) (TU Delft)
Copyright: © 2006 The Author(s); American Institute of Physics
DOI: https://doi.org/doi:10.1063/1.2227624
Laser mode locking Quantum cascade lasers Submillimetre wave lasers Laser modes Laser frequency stability Laser feedback Spectral line narrowing
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Published Date

20-07-2006

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Source:

Applied Physics Letters, 89 (3), 2006

ISSN:

0003-6951

ISBN:

0003-6951

Source:

http://link.aip.org/link/APPLAB/v89/i3/p031115/s1

Faculty

Applied Sciences

Department

Kavli Institute of Nanoscience

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.

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