{"id":14287,"date":"2026-09-28T12:59:51","date_gmt":"2026-09-28T09:59:51","guid":{"rendered":"https:\/\/en.csw.uobaghdad.edu.iq\/?p=14287"},"modified":"2026-09-28T13:11:47","modified_gmt":"2026-09-28T10:11:47","slug":"a-masters-thesis-at-the-college-of-science-for-women-discusses-numerical-modeling-of-vertical-cavity-surface-emitting-laser-for-photonics-design","status":"publish","type":"post","link":"https:\/\/en.csw.uobaghdad.edu.iq\/?p=14287","title":{"rendered":": A Master\u2019s Thesis at the College of Science for Women Discusses (Numerical Modeling of Vertical-Cavity Surface-Emitting Laser for Photonics Design)"},"content":{"rendered":"

[vc_row full_width=”stretch_row” rtl_reverse=”yes” css=”.vc_custom_1726859899671{margin-top: -150px !important;padding-top: 150px !important;padding-bottom: 60px !important;background-color: #f5f5f5 !important;}”][vc_column width=”1\/2″]

<\/div>
<\/div><\/div>
<\/div>

Master\u2019s<\/span> Discussion<\/span><\/span><\/span><\/p>\n

The College of Science for Women at the University of Baghdad discussed the Master’s thesis entitled \u201cNumerical Modeling of Vertical-Cavity Surface-Emitting Laser for Photonics Design\u201d<\/p>\n

by researcher Rand Mahdi.<\/p>\n<\/div><\/div><\/div>

<\/div>
<\/i>
Objectives of the Thesis<\/div><\/span>
[vc_column_text css=””]The study dealt with the design and modeling of a Vertical-Cavity Surface-Emitting Laser (VCSEL) operating at a target wavelength of 850.0 \u00b5m, where the Transfer Matrix Method (TMM) was used in a one-dimensional model to design and analyze the Distributed Bragg Reflectors (DBR). Then, the Finite Element Method (FEM) was used to develop a two-dimensional model that enables the study of the optical, electrical, and thermal characteristics of the device using RSoft LaserMOD software.[\/vc_column_text]<\/div><\/div>
<\/i>
Content of the Thesis<\/div><\/span>
[vc_column_text css=””]The device structure was based on Distributed Bragg Reflectors made of Al\u2080.\u2085\u2085Ga\u2080.\u2084\u2085As, with 36 pairs for the bottom mirror and 32 pairs for the top mirror, with an active region consisting of three quantum wells, each with a thickness of 0.008 \u00b5m, and an oxide aperture with a diameter of 10 \u03bcm, with the aim of comparing the performance of the one- and two-dimensional models.<\/p>\n

The results showed that the emission peaks in the two-dimensional model reached approximately 857 nm for GaAs and 860 nm for AlGaAs. The threshold current at a temperature of 300 K was approximately 0.45 mA for GaAs and 0.67 mA for AlGaAs. The results also showed an optical gain of 350 cm\u207b\u00b9 for the AlGaAs structure, compared with 400 cm\u207b\u00b9 for the GaAs structure. The mode field diameter was 3.4 \u03bcm and the divergence angle was 18\u00b0 for the AlGaAs structure, compared with 4 \u03bcm and 24\u00b0 for the GaAs structure, with self-heating effects appearing at elevated temperatures.[\/vc_column_text]<\/div><\/div>

<\/i>
Recommendation of the Thesis<\/div><\/span>
[vc_column_text css=””]<\/p>\n
    \n
  1. \n
      \n
    1. Study the influence of different aluminum concentrations in AlGaAs on the optical and thermal characteristics of VCSEL devices.<\/li>\n
    2. Optimize the cavity geometry and oxide aperture dimensions to improve mode confinement and minimize optical losses.<\/li>\n
    3. Extend the analysis to a three-dimensional (3D) model for more accurate representation of the behavior of real devices.<\/li>\n
    4. Experimentally validate the numerical results to ensure the accuracy and reliability of the simulation models.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n

      [\/vc_column_text]<\/div><\/div>

      <\/i>
      Degree of the Thesis<\/div><\/span>
      [vc_column_text css=””]The researcher was awarded a (Distinction).<\/strong>[\/vc_column_text]<\/div><\/div>
      <\/i>
      Picture of the Committee members<\/div><\/span>
      [vc_column_text css=””]<\/p>\n
      \n
      \n
      \"\"<\/div>\n<\/div>\n<\/div>\n

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