The challenge to realize such spectrometers lies in the necessary relative phase-stability of the applied laser pulses. The invention uses a rather simple and cost-effective principle and design for a coherent 2D spectrometer. High phase-stability of the laser beams is inherently reached using only conventional beam splitters and mirrors, and avoiding diffractive optics, pulse shapers or phase-locking loops. This setup of the spectrometer can be constructed for a broad range of wavelengths, ranging from infrared to visible and even ultraviolet light. Especially the unrestricted utilization of visible light and light of shorter wavelengths, which is possible with this invention, will be important, as many biological systems, organic photovoltaic cells or quantum dots have absorption spectra in this wavelength range.
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