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Related Concept Videos

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Related Experiment Video

Updated: Feb 8, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities.

Yue Zhao1,2,3, Jin-Chuan Zhang4,5,6, Feng-Min Cheng1,2,3

  • 1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China.

Nanoscale Research Letters
|July 11, 2018
PubMed
Summary

We demonstrate a tapered quantum cascade laser (QCL) array with a Talbot cavity, achieving fundamental supermode operation for improved beam quality. This design offers higher output power and near diffraction-limited divergence for mid-infrared applications.

Keywords:
Phase locked arraysQuantum cascade lasersSemiconductor lasers

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers

Background:

  • Broad area quantum cascade lasers (QCLs) face beam quality degradation at high power outputs.
  • Achieving high power and good beam quality simultaneously is a key challenge in QCL development.

Purpose of the Study:

  • To demonstrate a tapered QCL array integrated with a Talbot cavity.
  • To achieve fundamental supermode operation for improved beam quality and power scaling.

Main Methods:

  • Integration of a tapered QCL array with a Talbot cavity.
  • Investigation of supermode operation based on cavity configuration.
  • Characterization of far-field beam divergence and output power.

Main Results:

  • Fundamental supermode operation achieved with taper straight-end connected to Talbot cavity.
  • Near diffraction-limited beam divergence of 2.7° for the fundamental supermode.
  • Output power approximately three times higher than a single-ridge laser for a five-element array at 4.8 μm.
  • High-order supermode operation observed when taper-end connected to Talbot cavity.

Conclusions:

  • Talbot cavity integration enables fundamental supermode operation in tapered QCL arrays.
  • This approach enhances beam quality and power output for mid-infrared QCLs.
  • Cavity design critically influences supermode selection in QCL arrays.