摘要： Many recent applications of vector pulses require the characterization of time-dependent polarization of ultrashort laser pulses. For a precise measurement, the relative phase between the vector components is crucial. We propose a monolithic, in-line, single-channel interferometer setup, which allows the full determination of the time-evolving polarization state of the pulse, retrieving with precision the relative phase thanks to its great stability (~10-3). This is possible due to the use of a birefringent material (3-mm calcite) to delay the x- and y-components of the pulse. A linear polarizer (LP) is used to measure three projections with a spectrometer: 0o and 90o for the spectral amplitude of the x- and y-components, respectively, and 45o for the spectral interferences of the delayed components. By analysing the latter using Fourier-transform filtering, it is possible to retrieve the full relative phase (including constant term). The spectral phase of one component is measured with a standard temporal measurement device. Also, the system needs to be calibrated in amplitude and phase by measuring the same three spectral projections for a pulse linearly polarized at 45o. The polarization state of the vector pulses is characterized both in the spectral and the temporal domains: intensity, ellipticity, azimuth and phase difference.