A light pulse synchronizer (50) that synchronizes, with each other, a first light pulse generated at a first repetition frequency and a second light pulse generated at a second repetition frequency includes a modulator (10) configured to change an optical path length of at least one of the first and second light pulses at a modulation frequency, a photodetector (16) configured to receive the first and second light pulses to output a first signal, a timing detector (17) configured to output a second signal based on a signal with the modulation frequency and on the first signal, and an adjuster (19) configured to adjust at least one of the first and second repetition frequencies depending on the second signal.
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