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THE LENGTH OF PHOTON R. Jablonski1, V. Ryssakov1, A. Al-Tabich1 1Warsaw University of Technology, Faculty of Mechatronics, Institute of Metrology and Biomedical Engineering The problems of today challenge us to develop more accurate methods of manufacturing and measurements. This trend requires precise determination of fundamental physical quantities. Many manufacturing methods, such as laser processing or photolithography, are based on precisely controlled beam of light and hence the quantum of this energy – photon. There is no doubt that the photon size measurement would bring a very positive impact on the listed manufacturing and measurement methods. We demonstrate that the beatings of signal in the heterodyne interferometer can still be observed, even for the single-photon level beam. With such low intensity, the delay between successive photons reaches several microseconds, which translates to hundreds of meters. So if subsequent photons do not overlap, how is it possible that the beating phenomenon can still be observed? It could be easily explained, if we assume that the single photon length in fact reaches those hundreds of meters. This would allow photon wave packets to overlap and interfere. Taking into account the research[1] that has shown that the photon is unable to penetrate the slit with a diameter of a fraction of wavelength, it seems that the most appropriate model can be created in accordance to modified semi-classical (Copenhagen) approach. Photon would be a needle-shaped particle with transverse dimension of the order of a fraction of wavelength and length of the hundreds of meters. The paper presents the results of the described experiment which leads to such conclusions. References: [1] G. Hunter, R.L.P. Wadlinger, Photons and Neutrinos as Electromagnetic Solitons. Physics Essays. 2 (1989), 158.