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Injection-locking of terahertz quantum cascade lasers up to 35GHz using RF amplitude modulation.

Pierre Gellie1, Stefano Barbieri, Jean-François Lampin

  • 1Laboratoire Matériaux et Phénomènes Quantiques, Université Paris 7and CNRS UMR 7162, 10 rue A. Domont et L. Duquet, 75205 Paris, France.

Optics Express
|October 14, 2010
PubMed
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We demonstrate that Terahertz quantum cascade lasers can be injection-locked by modulating bias current with an RF source. This technique achieves phase-locking of the laser

Area of Science:

  • Quantum optics
  • Semiconductor lasers
  • Terahertz technology

Background:

  • Terahertz quantum cascade lasers (TQCLs) are crucial for various applications.
  • Controlling the frequency and phase of TQCLs is essential for advanced functionalities.
  • Injection-locking is a known technique for frequency control in lasers.

Purpose of the Study:

  • To investigate the injection-locking of TQCLs using direct bias current modulation.
  • To determine the locking range and phase-noise characteristics of injection-locked TQCLs.
  • To validate the findings against classical injection-locking theory.

Main Methods:

  • Direct modulation of the bias current of TQCLs with an Radio Frequency (RF) source.
  • Utilizing metal-metal and single-plasmon waveguide TQCLs with roundtrip frequencies up to 35 GHz.

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  • Measuring the locking range and phase noise under varying RF power levels.

    • Main Results:

    • Successful injection-locking of TQCL cavity resonance frequency (round-trip frequency) was achieved.
    • Locking ranges exceeding 200 MHz were observed for devices up to 35 GHz.
    • A square-root dependence of the locking range on RF power was confirmed, aligning with theory.

    Conclusions:

    • Direct bias current modulation is an effective method for injection-locking TQCLs.
    • The observed locking characteristics are consistent with established laser injection-locking principles.
    • These findings pave the way for mode-locking operation and enhanced TQCL applications.