The inherent brevity of ultrashort laser pulses prevents a direct measurement of their electric field as a function of time; therefore different approaches based on autocorrelation have been used to characterize them. We present a discussion, guided by experimental studies, regarding accurate measurement, compression, and shaping of ultrashort laser pulses without autocorrelation or interferometry. Our approach based on phase shaping, multiphoton intrapulse interference phase scan, provides a direct measurement of the spectral phase. Illustrations of this method include new results demonstrating wavelength independence, compatibility with sub-5 fs pulses, and a perfect match for experimental coherent control and biomedical imaging applications.
We demonstrate two-dimensional ultrafast fourier transform spectroscopy in the deep ultraviolet (approximately 260 nm) using an acousto-optic modulator based pulse shaper. The use of a pulse shaper in the ultraviolet allows for rapid scanning, high phase (time) stability (approximately 0.017 rad) and phase cycling. We present measurements on the DNA nucleobase Adenine.
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