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<p>High-power edge-emitting lasers (EELs) are pivotal in various applications but often suffer from thermal lensing, leading to the far-field pattern (FFP) blooming. This study, focusing on illumination applications, explores pulse width modulation (PWM) output control to mitigate this parasitic effect in green InGaN single-emitter EEL. Detailed goniophotometric measurements and encircled energy analysis were performed. These were supported by a step-by-step simulation manual to quantify the thermal blooming effect in continuous wave (CW) and PWM modes. The results demonstrate that PWM effectively controls thermal lensing, stabilizes FFPs, and thus improves spatial emission. This practical approach enhances performance and reliability and provides a comprehensive framework for optimizing EEL operation.</p>

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PWM-based far-field blooming mitigation in edge-emitting lasers

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Miroslav Slouka,
  • Ladislav Stanke,
  • Alexandra Pešátová,
  • Jan Pala,
  • Jan Látal,
  • Petr Šiška

摘要

High-power edge-emitting lasers (EELs) are pivotal in various applications but often suffer from thermal lensing, leading to the far-field pattern (FFP) blooming. This study, focusing on illumination applications, explores pulse width modulation (PWM) output control to mitigate this parasitic effect in green InGaN single-emitter EEL. Detailed goniophotometric measurements and encircled energy analysis were performed. These were supported by a step-by-step simulation manual to quantify the thermal blooming effect in continuous wave (CW) and PWM modes. The results demonstrate that PWM effectively controls thermal lensing, stabilizes FFPs, and thus improves spatial emission. This practical approach enhances performance and reliability and provides a comprehensive framework for optimizing EEL operation.