Toward attosecond metrology

Details Toward attosecond metrology Toward attosecond metrology

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..611...56h&link_type=abstract

SUPERSTRONG FIELDS IN PLASMAS: Second International Conference on Superstrong Fields in Plasmas, Second International Conference

Mathematics

Logic

Metrological Applications, Optical Frequency Synthesizers For Precision Spectroscopy, Auger Effect And Inner-Shell Excitation Or Ionization, Frequency Conversion, Harmonic Generation, Including Higher-Order Harmonic Generation, Ultrafast Processes, Optical Pulse Generation And Pulse Compression

Scientific paper

Ultrashort-pulse lasers constitute the fastest probes available for tracing transitions between different states of matter. They allow measuring time intervals on a femtosecond time scale and provide access to fundamental physical, chemical and biological processes on a microscopic scale in the time domain. The fastest speed at which events can be followed is limited by the laser pulse duration. Sub-10 femtosecond pulses are available in the visible and near infrared spectral range. They comprise only a few optical cycles, hence the phase of the carrier with respect to the pulse envelope becomes a significant issue. A method for controlling this phase is described in this paper. Several fundamental atomic processes such as inner-shell electronic relaxation or ionization by optical tunneling, however, take place within a fraction of the oscillation period of visible or near-infrared radiation and require very short probes for being investigated. Isolated bursts of radiation of the order of 1 femtosecond or shorter are required to reliably trace these dynamics never before accessed in the time domain. These single bursts need to be carried at substantially shorter wavelengths, preferably in the extreme ultraviolet (XUV) or X-ray regime, if bound atomic electrons are to be accessed in ultrafast spectroscopy. High harmonic generation using few-cycle pulses is ideal for this purpose. .

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