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Researchers developed a new method for creating Bragg lasers using PDMS stamps, offering a reusable and practical approach for laser metrology and optically pumped lasers.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Bragg lasers are crucial for various optical applications.
  • Current fabrication methods can be complex and costly.

Purpose of the Study:

  • To investigate laser performance using a novel PDMS stamp-based fabrication method.
  • To compare this method with traditional substrate-patterned gratings.

Main Methods:

  • Fabrication of Bragg lasers via conformal contact of patterned PDMS stamps with active films.
  • Comparison of laser thresholds, output efficiencies, and spectral characteristics.
  • Analysis of optical confinement and coupling coefficients.

Main Results:

  • PDMS-air (PA) distributed feedback (DFB) lasers exhibit higher thresholds than substrate-film (SF) lasers due to reduced optical confinement.
  • PA lasers show higher slope output efficiencies in both DFB and distributed Bragg reflector (DBR) configurations.
  • PDMS stamps demonstrate reusability, with performance limited by particle buildup.

Conclusions:

  • The PDMS stamp method offers a viable alternative for Bragg laser fabrication.
  • This technique is suitable for rapid laser metrology of new gain materials.
  • The system holds promise for practical applications in optically pumped lasers.