Optical pulse measurement using shearing interferometry, especially suitable for characterizing ultrashort pulses
AssigneeUniversity of Rochester
InventorsIan A. Walmsley, Christophe Dorrer
Life of this patent
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Abstract
Pulse measurement for characterization of ultra-short optical pulses using spectral phase interferometry for direct electric field reconstruction (SPIDER) is enhanced by utilizing a plurality of spectral phase differences derived from the pulse and measured and frequency sheared replicas, which are temporally and/or spatially displaced, thereby providing spatial or temporal characterization or enhancing the temporal characterization of the input pulse in amplitude and phase. Improved interferometry which is not reliant on non-linear elements can be used.
Claims16
A method for measuring a pulse which comprises the steps of shearing said pulse and providing, by both linear and non-linear interferometry, a plurality of spectral and temporal phase differences which are temporally, or both spatially and temporally, displaced, and characterizing the pulse from said phase differences in a spectrometer.
A system of interferometry comprising:
- means for transmitting a pulse in a beam along two paths which are tilted with respect to each other and which form two collinear beams at an output end of said paths;
- means for interfering the collinear beams at said output end;
- and
- means responsive to the interfering beams in at least two directions for obtaining spectral or temporal characteristics of said pulse.
A method of interferometry comprising the steps of:
- transmitting a pulse in a beam along two paths which are tilted with respect to each other and which form two collinear beams at an output end of said paths;
- interfering the collinear beams at said output end linearly or non-linearly;
- and
- obtaining spectral or temporal characteristics of said pulse in accordance with said interfering beams in at least two directions.
A method of interferometry comprising the steps of providing spectrally sheared beams corresponding to an input pulse, providing temporally or spatially sheared replicas of said input pulse, and imaging all said replicas on a two-dimensional spectrometer thereby obtaining information on the phase characteristics of said input pulse.
A method for measuring a pulse which comprises spectrally shearing said pulse to provide a plurality of spectral differences, temporally shearing said pulse to provide a plurality of temporal differences, and spatially and temporally characterizing said pulse from said differences.
Dependencies are inferred from the claim text.