Pulse measurement using frequency shifting techniques
AssigneeUniversity of Rochester
InventorsIan A. Walmsley, Christopher Iaconis
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Abstract
Amplitude and phase relative to an interferometrically established phase of ultrashort replica pulses (15) utilizes spectral phase interforemetry for direct electric field reconstruction by frequency shifting chirp replica pulses (16) of an optical pulse to be measured. The replicas of the pulses, relatively delayed in time, are generated by an interferometer (12).
Claims21
A method for measuring a pulse which comprises the step of translating said pulse into a pair of pulses which are sheared in frequency with respect to each other, and non-linearly processing said pair of pulses to derive an output which characterizes said pulse.
Apparatus for measuring pulses to characterize the time and/or frequency dependent amplitude and phase thereof which comprises means for spectrally shearing said pulses by means of a non-linearity resulting in an output, and means for spectrally analyzing said output for obtaining the time and/or frequency dependent characteristics of said pulses, and wherein said pulses are ultrafast optical pulses and said spectral shearing means includes means for interferometrically generating a pair of replicas for each of said pulses with a temporal delay τ therebetween, and means for mixing said pair of replicas non-linearly with a chirped signal to provide a spectral interferogram representing the shear of said replicas by being shifted in frequency with respect to each other.
Dependencies are inferred from the claim text.