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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Quantum cascade lasers with an integrated polarization mode converter.

D Dhirhe1, T J Slight, B M Holmes

  • 1School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK. d.dhirhe.1@research.gla.ac.uk

Optics Express
|November 29, 2012
PubMed
Summary

We designed and built a quantum cascade laser with a polarization mode converter. This device emits light with different polarizations from each facet, crucial for advanced optical applications.

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Area of Science:

  • Optics and Photonics
  • Quantum Electronics
  • Semiconductor Devices

Background:

  • Quantum cascade lasers (QCLs) are semiconductor lasers with unique emission properties.
  • Polarization control is essential for many QCL applications, including sensing and communications.
  • Integrated photonic devices offer advantages in miniaturization and performance.

Purpose of the Study:

  • To design, fabricate, and characterize a waveguide polarization mode converter for mid-infrared quantum cascade lasers.
  • To demonstrate integrated polarization control within a single QCL device.
  • To enable tailored polarization output for specific QCL applications.

Main Methods:

  • Design of a waveguide structure for polarization conversion.
  • Fabrication of a quantum cascade laser with an integrated polarization mode converter.
  • Characterization of the laser's output polarization from both facets.

Main Results:

  • Successful fabrication of a QCL with an integrated waveguide polarization mode converter operating at 4.6 μm.
  • Demonstration of asymmetric polarization output: 69% Transverse Electrical (TE) from one facet.
  • Demonstration of asymmetric polarization output: 100% Transverse Magnetic (TM) from the other facet.

Conclusions:

  • The integrated polarization mode converter effectively controls the output polarization of the QCL.
  • This device provides a versatile platform for applications requiring specific polarization states.
  • The fabricated device shows potential for advanced mid-infrared photonic systems.