Revisiting the double-slit experiment of light: from wave theory to pulse theory

Abstract: Because the experiments rely only on basic geometrical optics, they are accessible to readers with standard high-school physics training, enabling independent replication and critical evaluation without the need for specialized expertise or authoritative interpretation.The phenomenon of light interference, often regarded as a cornerstone of wave optics, is rarely observed in everyday life. This paper revisits the classic double-slit experiment and demonstrates that its results are not a true representation of wave interference, but rather a technological artifact designed to produce alternating light and dark fringes. Through a series of rigorous experiments, we show that the observed patterns in the double-slit setup lack scientific universality and cannot be generalized to real-world light behavior. A simple triangular phase formula is introduced to demonstrate that white light cannot sustain phase relationships, fundamentally challenging the traditional wave-based explanations. Instead, the experiments support the pulse particle theory of light, which posits that light behaves as discrete pulses rather than continuous waves. This new perspective on light has profound implications, particularly in the field of optical communication. By understanding light as pulses, we open up new avenues for advancements in technologies like laser communication, offering fresh approaches to addressing challenges in speed, efficiency, and signal transmission.An earlier version of this work was submitted to Optica Open Preprints (DOI: 10.1364/opticaopen.27255981). At the time of writing, the corresponding author is unable to access the preprint record or associated PDF due to a 403 (Forbidden) access restriction, including when logged in as the submitting author. A request for clarification has been sent to the platform. This OSF record is maintained to ensure continued accessibility and transparency of the scholarly record.