Abstract: An apparatus and a method for in-line measurement of laser pulses with time-dependent polarization are described, which make possible to carry out in-line measurement of laser pulses whose polarization depends on time. For this, one or more polarization projections are selected: the spectrometer detects the projection on the extraordinary propagation axis of a birefringent system to measure the spectrum in that component, also the projection on the ordinary propagation axis, to measure the spectrum in that component, and finally a projection in an intermediate direction that allows to measure the interference spectrum between the two components. The method allows extracting the temporal evolution of the pulse and its polarization state as a function of time, spectral amplitudes and phases of the various polarization projections of the beam.

Abstract: The present disclosure generally relates to laser systems and laser pulse characterization methods and respective systems. An embodiment of the method comprises generating two collinear replicas of the pulse being characterized; applying two different predetermined spectral phases to each replica, so as to simultaneously scan delay and dispersion; applying a nonlinear process to the pulse to be characterized; measuring the resulting signal from the application of the predetermined spectral phases and nonlinear process; applying a numerical iterative algorithm to the measured signal to retrieve the spectral phase of the pulse to be characterized; such process being done as a scanning procedure or in parallel utilizing a single laser shot.

Abstract: The optical system comprises: means for introducing a controlled negative or positive chirp to an incoming ultrashort laser pulse to be characterized; a nonlinear optical medium through which said chirped ultrashort laser pulse is propagated, wherein as a result of said propagation: different chirp values are introduced in the ultrashort laser pulse at different propagation distances along the nonlinear optical medium, and a transverse nonlinear signal is generated in a direction perpendicular to the propagation axis; analyzing means configured for recording a single-shot spectral image of said generated transverse nonlinear signal; and a processing module comprising one or more processors configured to execute a numerical iterative algorithm to said single-shot spectral image to retrieve the electric field, amplitude and phase, of the ultrashort laser pulse.

Abstract: An apparatus and a method for in-line measurement of laser pulses with time-dependent polarization are described, which make possible to carry out in-line measurement of laser pulses whose polarization depends on time. For this, one or more polarization projections are selected: the spectrometer detects the projection on the extraordinary propagation axis of a birefringent system to measure the spectrum in that component, also the projection on the ordinary propagation axis, to measure the spectrum in that component, and finally a projection in an intermediate direction that allows to measure the interference spectrum between the two components. The method allows extracting the temporal evolution of the pulse and its polarization state as a function of time, spectral amplitudes and phases of the various polarization projections of the beam.

Abstract: The present disclosure generally relates to laser systems and laser pulse characterization methods and respective systems. An embodiment of the method comprises generating two collinear replicas of the pulse being characterized; applying two different predetermined spectral phases to each replica, so as to simultaneously scan delay and dispersion; applying a nonlinear process to the pulse to be characterized; measuring the resulting signal from the application of the predetermined spectral phases and nonlinear process; applying a numerical iterative algorithm to the measured signal to retrieve the spectral phase of the pulse to be characterized; such process being done as a scanning procedure or in parallel utilizing a single laser shot.

Abstract: The optical system comprises: means for introducing a controlled negative or positive chirp to an incoming ultrashort laser pulse to be characterized; a nonlinear optical medium through which said chirped ultrashort laser pulse is propagated, wherein as a result of said propagation: different chirp values are introduced in the ultrashort laser pulse at different propagation distances along the nonlinear optical medium, and a transverse nonlinear signal is generated in a direction perpendicular to the propagation axis; analyzing means configured for recording a single-shot spectral image of said generated transverse nonlinear signal; and a processing module comprising one or more processors configured to execute a numerical iterative algorithm to said single-shot spectral image to retrieve the electric field, amplitude and phase, of the ultrashort laser pulse.