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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Direct measurement and analysis of the carrier-envelope phase in light pulses approaching the single-cycle regime

P Dombi1,7, A Apolonski1,2, Ch Lemell3, G G Paulus4, M Kakehata5, R Holzwarth6, Th Udem6, K Torizuka5, J Burgdörfer3, T W Hänsch6 and F Krausz1,6

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We demonstrate a solid-state device capable of providing direct information about the carrier-envelope (CE) phase of ultrashort (4 fs) laser pulses. The measurement is based on multi-photon-induced photoelectron emission from a gold surface. The amount of the charge emitted from the surface gives a clear indication of phase sensitivity, as predicted by our simulations and also by a simple intuitive model. This phenomenon was used to determine the CE phase value of each laser pulse in a mode-locked, unamplified, low-energy pulse train. The inability of the commonly used f-to-2f interferometric method to measure accurately extracavity drifts of the CE phase is discussed and contrasted with the direct phase measurement method proposed here. The evolution of the CE phase upon propagation of pulses comparable in duration to the optical cycle is analysed.


PACS

79.60.Bm Clean metal, semiconductor, and insulator surfaces

68.47.De Metallic surfaces

42.60.-v Laser optical systems: design and operation

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Optics, quantum optics and lasers

Dates

Issue 1 (March 2004)

Received 15 January 2004

Published 29 March 2004



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