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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper CF_8_5

Multidimensional harmonic phase spectroscopy

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Abstract

Over the past few years, many advances of attosecond science, and in particular of high harmonic spectroscopy (HHS), have been paced by the development of phase measurement techniques. We are now in a position where five to six experimental schemes are demonstrated, being either all optical interferometry or relying on quantum interferometry of electronic wave packets [1–8]. When measured simultaneously, some of them gave consistent results (see e.g. RABBIT technique and the measurement of photo-induced currents [4]), other did not (e.g. Ref. [9]). HHS being very nonlinear, the results may be very much laser dependent and discrepancies between the methods were argued to be mostly due to drifts or miscontrol of the generation conditions. For instance, mixtures of gases require several measurements in a row and often give imaginary phases (cosines above 1, e.g. Ref. [9]). To clarify the situation, we here report on the simultaneous implementation of the two sources [10] and Rabbit technique and on their direct comparison.

© 2015 IEEE

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