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Long Scan Autocorrelator

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Long Scan Autocorrelator

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Direct measurements of laser pulses less than 20ps using photo detectors remain a challenge. The response time of high-speed photodiodes is currently limited to around 20 picoseconds; moreover, large bandwidth oscilloscopes (>60 GHz) required to accurately measure the output of these detectors are quite expensive. Several indirect methods for measuring ultrashort pulses have been developed. Detailed reviews can be found in, “Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses,” by Rick Trebino, Kluwer Academic Publishers, Boston, 2002, and “Ultrashort Laser Pulse Phenomena,” by Jean Claude Diels and Wolfgang Rudolph, Academic Press, New York, 1995. When phase information of the pulse is not required, autocorrelation is the simplest and most affordable method for determining pulse width.

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