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Patent Granted PROBLEM TO BE SOLVED: To obtain a practical ultrashort pulse light source which is highly stabilized, miniaturized, highly operable, low in price, and high in peak power. ; SOLUTION: The semiconductor ultrashort pulse light source includes a single vertical mode semiconductor laser 10, an electric pulse generator 20 for obtaining optical pulse by driving the single vertical mode semiconductor laser 10 through a gain switch and at least one set of optical amplifier 50 for amplifying the generated optical pulse