Device for imaging spectroscopy for simultaneous spectrally and spatially resolved acquisition of all pixels of large-area samples, the device comprising: a light source, a signal detection unit for measuring the spectroscopic signal, an optical system for directing light in form of a first light path onto the sample and for collecting light that is scattered, emitted or reflected by the sample and guiding the collected light away from the sample towards the signal detection unit in form of a second light path, wherein the optical system comprises: a fiber bundle provided for guiding the scattered, emitted or reflected light to the signal detection unit, wherein the fibers of the fiber bundle are arranged as two-dimensional fiber matrix at the sample side, and arranged as one row at the side of the signal detection unit, a first microlens array arranged in the first light path, whereby the first microlens array is arranged to focus the light onto the sample as well as to collect the light that is scattered, emitted or reflected by the sample, a second microlens array arranged in the second light path, whereby the second microlens array is arranged to focus the collected light individually into single fibers (107, 108) of the two-dimensional fiber matrix, and a square core fiber, which is connected to the light source, provided for guiding the light to the first light path. a light source, a signal detection unit for measuring the spectroscopic signal, an optical system for directing light in form of a first light path onto the sample and for collecting light that is scattered, emitted or reflected by the sample and guiding the collected light away from the sample towards the signal detection unit in form of a second light path, wherein the optical system comprises: a fiber bundle provided for guiding the scattered, emitted or reflected light to the signal detection unit, wherein the fibers of the fiber bundle are arranged as two-dimensional fiber matrix at the sample side, and arranged as one row at the side of the signal detection unit, a first microlens array arranged in the first light path, whereby the first microlens array is arranged to focus the light onto the sample as well as to collect the light that is scattered, emitted or reflected by the sample, a second microlens array arranged in the second light path, whereby the second microlens array is arranged to focus the collected light individually into single fibers (107, 108) of the two-dimensional fiber matrix, and a square core fiber, which is connected to the light source, provided for guiding the light to the first light path. a fiber bundle provided for guiding the scattered, emitted or reflected light to the signal detection unit, wherein the fibers of the fiber bundle are arranged as two-dimensional fiber matrix at the sample side, and arranged as one row at the side of the signal detection unit, a first microlens array arranged in the first light path, whereby the first microlens array is arranged to focus the light onto the sample as well as to collect the light that is scattered, emitted or reflected by the sample, a second microlens array arranged in the second light path, whereby the second microlens array is arranged to focus the collected light individually into single fibers (107, 108) of the two-dimensional fiber matrix, and a square core fiber, which is connected to the light source, provided for guiding the light to the first light path.