Abstract
We present a three-dimensional measurement of the local focal phase in a focused broadband Gaussian laser beam and find strong deviations from the commonly assumed Gouy phase, with wide ramifications for ultrafast physics.
Highlights
Precise knowledge of the behaviour of the phase of light in the focus of a laser beam is fundamental to understand and control laser-driven processes
We present a three-dimensional measurement of the local focal phase in a focused broadband Gaussian laser beam and find strong deviations from the commonly assumed Gouy phase, with wide ramifications for ultrafast physics
Direct, three-dimensional measurement of the focal carrier-envelope phase (CEP) evolution of a few-cycle (4-fs), near-infrared laser beam, spanning a range of seven times
Summary
Precise knowledge of the behaviour of the phase of light in the focus of a laser beam is fundamental to understand and control laser-driven processes. More than a hundred years ago the axial phase evolution for focused monochromatic light beams was described and is commonly known as the Gouy phase [1]. Recent theoretical work has brought into question the validity of applying this monochromatic phase formulation to the broadband laser pulses becoming ubiquitous today [2]. The need for investigation of the spatial behaviour of the local carrier-envelope phase (CEP) is underscored by experimental studies, which suggest deviations from the monochromatic Gouy phase (see for instance [3])
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