Time of flight for photon in human skin

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Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia

Inesa Ferulova
Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia

Alexey Lihachev
Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia

Janis Spigulis
Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia


Paper #3044 received 2016.05.18; revised manuscript received 2016.09.16; accepted for publication 2016.09.29; published online 2016.09.30.

DOI: 10.18287/JBPE16.02.030301

Abstract

The time of flight for photons in human skin was measured using picosecond diode laser. Two different wavelength lasers were used - 405 nm and 510 nm. A difference for time of flight in normal skin and in nevus was observed as well as a difference for different wavelength laser irradiation was observed. For 405 nm laser irradiation the difference was 41 ps while comparison of time of flights skin and nevi using 510 nm irradiation showed a result of 32 ps. Results allow to conclude that the time photon travels in skin might depend on the characteristics of the medium and wavelength of the irradiation. This can be related to known data for light penetration depth in human skin for different wavelengths.

Keywords

absorbtion; light impulse; biophotonics; medical physics

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References


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