Abstract
Recent progress of ultrashort pulse lasers and pulse compression techniques has allowed us to generate pulses with duration of the order of 10 fs or less.The development of measurement techniques is also necessary for characterizing the ultrashort pulses. Linear direct measurement combined with photodetectors and oscilloscopes or ultrafast streak camera is no longer adequate to temporally resolve these pulses. Instead, various nonlinear correlation methods based on the nonlinear optical processes with time resolution of subpicosecond or femtosecond are proposed and demonstrated.The basic concept, advantages and limitations of the methods including the recent development are discussed here.
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