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Sökning: WFRF:(Prokop Nando)

  • Resultat 1-6 av 6
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  • Haglund, Åsa, 1976, et al. (författare)
  • Out of the blue: UV VCSELs
  • 2022
  • Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - 0277-786X .- 1996-756X. ; PC12001
  • Konferensbidrag (refereegranskat)abstract
    • In recent years, there has been tremendous improvement in the performance of blue-emitting vertical-cavity surface-emitting lasers (VCSELs) and they are now on the cusp of commercialization. We will summarize state-of-the-art results and outline the main challenges in extending the emission wavelength into the ultraviolet (UV). Our method to simultaneously achieve high-reflectivity mirrors and good cavity length control by selective electrochemical etching has been essential to demonstrate the world’s first UV-B VCSEL. The use of dielectric mirrors, where one material has a negative thermo-optical coefficient, counteracts the inherent red-shift of the resonance wavelength, enabling a temperature-stable emission.
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  • Haglund, Åsa, 1976, et al. (författare)
  • Thin-film UV VCSELs and LEDs by electrochemical etching
  • 2022
  • Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - 0277-786X .- 1996-756X. ; PC12022
  • Konferensbidrag (refereegranskat)abstract
    • We will give an overview of state-of-the-art results and challenges to achieve high-performing III-nitride vertical-cavity surface-emitting lasers (VCSELs), with a particular focus on the requirements to push the emission wavelength into the ultraviolet (UV). Our method to simultaneously achieve high-reflectivity mirrors and good cavity length control by electrochemical etching enabled the world’s first UV-B VCSEL. The use of dielectric mirrors yielded lasers with a very temperature-stable emission wavelength thanks to the negative thermo-optic coefficient of the mirrors. We have used the same etch methodology to also lift-off fully processed LEDs from their growth substrate to improve the light extraction efficiency.
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  • Haglund, Åsa, 1976, et al. (författare)
  • UV VCSELs – this is the way
  • 2022
  • Ingår i: 9th Workshop on Physics and Technology of Semiconductor Lasers.
  • Konferensbidrag (refereegranskat)
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  • Resultat 1-6 av 6

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