PWM strategies for mitigating parasitic effects in LEDs, EELs, and VCSELs: experimental insights from author’s publications

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15210%2F25%3A73632947" target="_blank" >RIV/61989592:15210/25:73632947 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.researchgate.net/publication/403118681_Calculation_of_Encircled_Energy_from_Photogoniometric_Data_and_Its_Use_for_Evaluating_the_Radiation_Pattern_of_a_Laser_Diode" target="_blank" >https://www.researchgate.net/publication/403118681_Calculation_of_Encircled_Energy_from_Photogoniometric_Data_and_Its_Use_for_Evaluating_the_Radiation_Pattern_of_a_Laser_Diode</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

PWM strategies for mitigating parasitic effects in LEDs, EELs, and VCSELs: experimental insights from author’s publications

Popis výsledku v původním jazyce

Pulse-width modulation (PWM) has emerged as a cost-effective and widely accessible control technique forsemiconductor light sources, extending far beyond its traditional role in brightness regulation under continuouswave (CW) operation. This review provides a comprehensive analysis of PWM applicability for mitigating parasitic phenomena in selected automotive LEDs, edge-emitting lasers (EELs), and large-aperture verticalcavity surface-emitting lasers (VCSELs). In automotive LEDs, PWM can improve color stability and reduce perceptible chromatic shifts, particularly for phosphor-converted white emitters, but this benefit is not universal across LED types. At equal average current, PWM at 1 kHz typically yields lower luminous flux and higher thermal load compared with CW driving. In EELs, PWM stabilizes spectral emission, enables wavelength tuning, and effectively suppresses thermal blooming that degrades far-field patterns under CW operation. For large-aperture VCSELs, PWM enables dynamic mode redistribution and spatial control of the far-field profile, with low-frequency driving maintaining beam stability and higher frequencies promoting Gaussian-like modal selection. This review critically summarizes the author’s research contributions in these areas. It places them within the broader context of current developments, providing strategic recommendations for PWM-based mitigation of parasitic phenomena in selected types of semiconductor light sources. Our experiments quantify light output from a technical and photometric perspective but do not evaluate human perceptual or physiological responses. Given motion- and saccade-dependent sensitivity to flicker, stroboscopic, and phantom-array artifacts that extend beyond classical fusion limits, we provide a concise, theory-based appraisal of the potential implications for human health and well-being. These constraints contextualize the engineering results and motivate future interdisciplinary validation across vision science and human factors.

Název v anglickém jazyce

PWM strategies for mitigating parasitic effects in LEDs, EELs, and VCSELs: experimental insights from author’s publications

Popis výsledku anglicky

Pulse-width modulation (PWM) has emerged as a cost-effective and widely accessible control technique forsemiconductor light sources, extending far beyond its traditional role in brightness regulation under continuouswave (CW) operation. This review provides a comprehensive analysis of PWM applicability for mitigating parasitic phenomena in selected automotive LEDs, edge-emitting lasers (EELs), and large-aperture verticalcavity surface-emitting lasers (VCSELs). In automotive LEDs, PWM can improve color stability and reduce perceptible chromatic shifts, particularly for phosphor-converted white emitters, but this benefit is not universal across LED types. At equal average current, PWM at 1 kHz typically yields lower luminous flux and higher thermal load compared with CW driving. In EELs, PWM stabilizes spectral emission, enables wavelength tuning, and effectively suppresses thermal blooming that degrades far-field patterns under CW operation. For large-aperture VCSELs, PWM enables dynamic mode redistribution and spatial control of the far-field profile, with low-frequency driving maintaining beam stability and higher frequencies promoting Gaussian-like modal selection. This review critically summarizes the author’s research contributions in these areas. It places them within the broader context of current developments, providing strategic recommendations for PWM-based mitigation of parasitic phenomena in selected types of semiconductor light sources. Our experiments quantify light output from a technical and photometric perspective but do not evaluate human perceptual or physiological responses. Given motion- and saccade-dependent sensitivity to flicker, stroboscopic, and phantom-array artifacts that extend beyond classical fusion limits, we provide a concise, theory-based appraisal of the potential implications for human health and well-being. These constraints contextualize the engineering results and motivate future interdisciplinary validation across vision science and human factors.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Jemná mechanika a optika

ISSN

0447-6441

e-ISSN

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Svazek periodika

2025

Číslo periodika v rámci svazku

11-12

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

10

Strana od-do

211-220

Kód UT WoS článku

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EID výsledku v databázi Scopus

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