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Beam shaping in high-power broad-area quantum cascade lasers using optical feedback.

Simon Ferré1,2,3, Louise Jumpertz2,4, Mathieu Carras2

  • 1Thales Research &Technology, 1 avenue Augustin Fresnel, 91767 Palaiseau, France.

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|March 14, 2017
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Summary

High-power quantum cascade lasers can achieve better beam quality using optical feedback. This flexible method controls beam profiles for high-quality mid-infrared sources, outperforming complex existing technologies.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers

Background:

  • Broad-area quantum cascade lasers (QCLs) are crucial for infrared countermeasures but suffer from poor beam quality due to multimode operation, diffraction, and self-focusing.
  • Achieving high output power and efficient heat dissipation in QCLs remains a challenge for practical applications.

Purpose of the Study:

  • To investigate the nonlinear control of quantum cascade laser beam profiles using optical feedback.
  • To explore methods for improving beam quality and enabling flexible beam shaping for mid-infrared sources.

Main Methods:

  • Utilizing optical feedback with a tunable mirror to control the near-field beam profile of high-performance QCLs.
  • Sequentially exciting different cavity modes by adjusting the feedback mirror angle.
  • Implementing spatial filtering for further refinement of the near-field beam profile.
  • Analyzing the effects of inhomogeneous gain and cavity width on beam shaping.

Main Results:

  • Optical feedback effectively tailored the near-field beam profile of broad-area quantum cascade lasers.
  • Sequential excitation of cavity modes and spatial filtering provided precise control over beam characteristics.
  • The study demonstrated the impact of gain inhomogeneity and cavity width on beam shaping capabilities.

Conclusions:

  • Beam shaping using optical feedback offers a flexible and cost-effective alternative to complex technologies for generating high-quality mid-infrared sources.
  • This approach enhances the applicability of high-power quantum cascade lasers in various fields requiring superior beam quality.