Abstract: A device for reception and transmission of electromagnetic waves in the visible and/or infrared spectral region and/or the UV-region, emitted by a gaeous, liquid or solid material sample, to an analytical unit, preferably for the determination of the temperature of the material sample. The device comprises a heat-resistant sleeve, open at the front end, with a light wave guide coupled to the analytical unit. In order to record the electromagnetic waves of high intensity, the device has a heat-resistant protective element, arranged at the front end region of the sleeve, which conducts electromagnetic waves.