Measuring light speed with a modulated laser diode

Alberto Ronzani, Francesco MacCarrone, Alberto Di Lieto

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)


The time of flight (TOF) of a light pulse travelling back and forth and optical path length measurements are used to estimate the velocity of light. The light pulse has a duration of 10 ns, and is obtained from a suitably modified CW commercial laser diode. The TOF is read with a digital oscilloscope connected to two fast sensors, detecting the signals at the switch-on of a laser diode and at the arrival of the light pulse reflected from a plane mirror placed at a known distance.

Original languageEnglish
Pages (from-to)957-965
Number of pages9
JournalEuropean Journal of Physics
Issue number5
Publication statusPublished - 1 Sept 2008
MoE publication typeA1 Journal article-refereed


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