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Perfectly phase-matched third-order distributed feedback terahertz quantum-cascade lasers.

Tsung-Yu Kao1, Qing Hu, John L Reno

  • 1Department of Electrical Engineering and Computer Science & Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. wilt_kao@mit.edu

Optics Letters
|June 5, 2012
PubMed
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We developed a new laser cavity for terahertz quantum-cascade lasers using perfect phase-matching. This design enhances laser performance, producing narrow beams and significant optical power for advanced terahertz applications.

Area of Science:

  • Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Terahertz quantum-cascade lasers (TQCLs) are crucial for various applications.
  • Existing distributed feedback (DFB) TQCLs face limitations in usable cavity length and beam quality.
  • Novel cavity designs are needed to improve TQCL performance.

Purpose of the Study:

  • To introduce a novel laser cavity design for third-order distributed feedback (DFB) terahertz quantum-cascade lasers.
  • To enhance the usable length and beam characteristics of TQCLs through perfect phase-matching.
  • To demonstrate improved optical power and slope efficiency in the new TQCL design.

Main Methods:

  • Implementation of a novel laser cavity design utilizing a perfectly phase-matching technique.

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  • Fabrication of third-order DFB terahertz quantum-cascade lasers with multiple apertures.
  • Characterization of single-frequency emission, beam divergence, optical power, and slope efficiency.

    • Main Results:

    • The novel design substantially increases the usable length of the third-order DFB laser.
    • Single-frequency emissions from 151 apertures coherently combined to form a narrow beam (FWHM≈6×11°).
    • A device with 40 apertures achieved over 5 mW optical power with a slope efficiency of ~140 mW/A at 10 K pulsed operation.

    Conclusions:

    • The perfectly phase-matching technique offers a significant advancement in TQCL cavity design.
    • This approach enables the generation of narrow, high-quality beams from TQCLs.
    • The demonstrated performance highlights the potential of this design for practical terahertz applications.