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We present results showing that, when it is used as a photodetector, a light-emitting diode (LED) has a powerdependent response that can be used for sensitive detection and characterization of picosecond and femtosecond laser pulses. A characterization of a typical LED is presented at 800 nm, and we demonstrate how this effect can be used to construct an extremely compact novel autocorrelator based on a Wollaston prism.doi:10.1364/ol.22.000233 pmid:18183160 fatcat:ubcqlocrgbcufc26x5n277ry5m