Patent ID: 7961379

Claim:
A pump probe measuring device comprising: an ultrashort optical pulse laser generator for generating a first ultrashort optical pulse train, which becomes a pump light, and a second ultrashort optical pulse train, which becomes a probe light; a delay time adjusting unit for adjusting a delay time of said first and second ultrashort optical pulse trains; a first pulse picker and a second pulse picker for reducing effective repetition frequency of optical pulses by accepting each of said first and second ultrashort optical pulse trains and transmitting only one pulse at an arbitrary repetition frequency; a delay time modulating unit for periodically changing a position through which optical pulses are transmitted by said first and second pulse pickers; a measuring unit for detecting probe signals from a sample equipped with an irradiation optical system for applying said pump light and said probe light to said sample; and a lock-in detecting unit for performing a phase-sensitive detection of probe signals from said sample at a modulation frequency of said delay time modulation unit, wherein the first or the second pulse picker changes the position through which optical pulses are transmitted, thus changing the delay time between the optical pulse that is transmitted through said second pulse picker or the optical pulse that is transmitted through said first pulse picker.