title: Single-shot detection and direct control of carrier phase drift of midinfrared pulses.
abstract: We introduce a scheme for single-shot detection and correction of the carrier-envelope phase (CEP) drift of femtosecond pulses at mid-IR wavelengths. Difference frequency mixing between the mid-IR field and a near-IR gate pulse generates a near-IR frequency-shifted pulse, which is then spectrally interfered with a replica of the gate pulse. The spectral interference pattern contains shot-to-shot information of the CEP of the mid-IR field, and it can be used for simultaneous correction of its slow drifts. We apply this technique to detect and compensate long-term phase drifts at 17 microm wavelength, reducing fluctuations to only 110 mrad over hours of operation.
authors.affiliation: Max Planck Research Group for Structural Dynamics, University of Hamburg, Center for Free Electron Laser Science, c/o DESY, Notkestrasse, 85-22607 Hamburg, Germany. cristian.manzoni@mpsd.cfel.de
authors.forename: Cristian
authors.initials: C
authors.lastname: Manzoni
authors.forename: Michael
authors.initials: M
authors.lastname: Först
authors.forename: Henri
authors.initials: H
authors.lastname: Ehrke
authors.forename: Andrea
authors.initials: A
authors.lastname: Cavalleri