Mark Kraman

University of Illinois Urbana-Champagne
  • May 11, 2022 // 3:20pm

    9.5 Impact of Diffusion Mask Strain on Impurity-Induced Disordered VCSELs Designed for Single-Fundamental-Mode Operation

    Patrick Su, University of Illinois at Urbana-Champaign
    John M Dallesasse, University of Illinois at Urbana-Champaign
    Mark Kraman, University of Illinois Urbana-Champagne
    Kevin P. Pikul, University of Illinois Urbana-Champagne

    Student Presentation

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  • 9.6.2021 Standing Wave Engineering for Mode Control in Single-Mode Oxide-Confined Vertical-Cavity Surface-Emitting Lasers

    Kevin P. Pikul, University of Illinois Urbana-Champagne
    Patrick Su, University of Illinois at Urbana-Champaign
    Mark Kraman, University of Illinois Urbana-Champagne
    Fu-Chen Hsiao, North Carolina State University
    John Dallesasse, University of Illinois at Urbana-Chamapign
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  • 14.2.2023 Assessment of 1.3-?m InAs QD Edge-Emitting Lasers Grown on Large Area GaAs Substrates

    Sara Gillgrass, Cardiff University
    Craig Allford, Cardiff University
    Mukul Debnath, IQE plc
    Andrew Clark, IQE, Cardiff, UK
    Peter M. Smowton, Cardiff University

    14.2.2023 CS_MANTECH-2023_14.2_Final

  • 8.2.3.2024 Polarization Control in Vertical-Cavity Surface-Emitting Lasers via Elliptical Aperture Definition in Optical Coatings

    Kevin P. Pikul, University of Illinois Urbana-Champagne
    Leah Espenhahn, University of Illinois at Urbana-Champaign
    Patrick Su, University of Illinois at Urbana-Champaign
    John M Dallesasse, University of Illinois at Urbana-Champaign

    8.2.3.2024 Polarization Control in Vertical-Cavity Surface-Emitting Lasers via Elliptical

  • 10A.4 – Single-Mode, Polarization Stable 2D-VCSEL Arrays via Elliptical Disorder-Defined Apertures

    Kevin P. Pikul, University of Illinois Urbana-Champagne
    Leah Espenhahn, University of Illinois at Urbana-Champaign
    P. Su, University of Illinois at Urbana-Champaign
    Mark Kraman, University of Illinois Urbana-Champagne
    J.M. Dallesasse, University of Illinois at Urbana-Champaign

    10A.4 Final.2025

    2D-VCSEL arrays utilizing elliptical disorder-defined apertures for simultaneous single-mode, singlepolarization operation are demonstrated. Optical losses induced by the disordered region in the periphery of the VCSEL suppress the capability of higher-order modes from lasing, achieving single-fundamental mode
    operation. Furthermore, introducing eccentricity to the aperture creates an asymmetric threshold gain, or dichroism, that selectively suppresses one of the two polarization states inherent to VCSELs, resulting in single-polarization operation. The work presented here discusses the design, fabrication, and characterization results of the 2D-VCSEL arrays. The arrays are characterized for optical output power, single-mode performance via optical spectra measurements, and single-polarization performance via polarization-resolved light-current-voltage (PR-LIV) curves.