Miroslav Slouka, Ladislav Stanke, Alexandra Pešátová, Jan Pala, Jan Látal, Petr Šiška
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PWM-based far-field blooming mitigation in edge-emitting lasers
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.
期刊介绍：
Optical and Quantum Electronics provides an international forum for the publication of original research papers, tutorial reviews and letters in such fields as optical physics, optical engineering and optoelectronics. Special issues are published on topics of current interest.
Optical and Quantum Electronics is published monthly. It is concerned with the technology and physics of optical systems, components and devices, i.e., with topics such as: optical fibres; semiconductor lasers and LEDs; light detection and imaging devices; nanophotonics; photonic integration and optoelectronic integrated circuits; silicon photonics; displays; optical communications from devices to systems; materials for photonics (e.g. semiconductors, glasses, graphene); the physics and simulation of optical devices and systems; nanotechnologies in photonics (including engineered nano-structures such as photonic crystals, sub-wavelength photonic structures, metamaterials, and plasmonics); advanced quantum and optoelectronic applications (e.g. quantum computing, memory and communications, quantum sensing and quantum dots); photonic sensors and bio-sensors; Terahertz phenomena; non-linear optics and ultrafast phenomena; green photonics.
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