Time-resolved spectrometer and method for time-resolved acquisition of a spectrum of a sample

摘要

The present invention relates to a spectrometer (1, 1 ') for the time-resolved detection of a spectrum of a sample. In order to provide a spectrometer based on a wavelength-time conversion with an improved sampling rate, a spectrometer according to the invention is proposed with a first source (6, 6 ') for generating electromagnetic radiation, a sample holder (7) arranged such that a in the sample holder (7) recorded sample in a beam path of the first source (6, 6 ') in the operation of the spectrometer (1, 1') generated electromagnetic radiation, a second source (2) for generating an electromagnetic pulse, a first group-velocity-dispersive element (3) in a beam path of the electromagnetic pulse generated by the second source (2) in operation of the spectrometer (1, 1 '), a non-linear optical element (9) in the beam path of the electromagnetic radiation of the first source (6, 6 ') behind the sample holder (7) and in the beam path of the electromagnetic pulse from the second Q uelle (2) behind the first group-velocity dispersive element (3) is arranged such that the beam paths in the non-linear optical element (9) spatially overlap, wherein in the operation of the spectrometer (1, 1 '), the electromagnetic radiation from the first Source (6, 6 ') and the electromagnetic pulse from the second source (2) as pump radiation and as signal radiation in the non-linear optical element (9) by four-wave mixing generate an Idler radiation, a detector for the idler Radiation and a detection device electrically connected to the detector, which is set up in such a way that, during operation of the spectrometer (1, 1 '), it records the power of the idler radiation striking the detector in a time-resolved manner.