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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Tree array quantum cascade laser.

Leonard K Hoffmann1, Matthias Klinkmüller, Elvis Mujagić

  • 1Institute for Solid State Electronics, Vienna University of Technology, 1040 Vienna, Austria. leonard.hoffmann@tuwien.ac.at

Optics Express
|January 23, 2009
PubMed
Summary
This summary is machine-generated.

This study explores a new monolithic coupling method for mid-infrared quantum cascade laser arrays to boost brightness. The novel tree-shaped resonator design achieves phase-locking and in-phase emission, demonstrating potential for enhanced laser performance.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers

Background:

  • Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
  • Enhancing the brightness of QCL arrays is a key challenge for high-power applications.

Purpose of the Study:

  • To investigate a monolithic coupling scheme for brightness enhancement in mid-infrared quantum cascade laser arrays.
  • To analyze the performance of a tree-shaped resonator design for parallel coupling of laser elements.

Main Methods:

  • Fabrication of a monolithic tree-shaped resonator integrating six laser elements using Y-junctions.
  • Far-field analysis to observe phase-locking and emission characteristics.
  • Optical power measurements to assess coupling losses and slope efficiency.
  • Near-field and spectral analysis to understand modal dynamics.

Main Results:

  • Successful parallel coupling of six laser elements into a single output.
  • Observed phase-locking leading to in-phase emission, matching theoretical profiles.
  • Negligible coupling losses confirmed by optical power measurements.
  • Slope efficiency below theoretical expectations due to modal competition.

Conclusions:

  • The monolithic coupling scheme demonstrates high modal control and potential for brightness scaling.
  • Modal competition limits slope efficiency, highlighting areas for future improvement.
  • Findings provide a foundation for developing more efficient, compact, and high-brightness QCL arrays.