Device for Providing Excitation Light for Analyzing a Biological Sample by Means of Fluorescence Measurement and Method for Operating Such a Device

A device for providing excitation light for analyzing a biological sample by way of fluorescence measurement, the device comprising:

• a light emission unit which is designed to selectively emit first emission light via a first beam path or second emission light via a second beam path, wherein the first beam path and the second beam path run at least partially separately from each other;
• a filter unit configured to filter the first emission light and the second emission light to transmit different predefined excitation bands of the respective emission light to produce the excitation light, wherein the filter unit comprises a plurality interference filters for the different excitation bands and a filter changing device to which the interference filters are attached, and wherein the filter changing device is designed to move the interference filters together and to arrange one of the interference filters in each beam path;
• and
• a deflection unit designed to combine the beam paths and direct them to an output of the device for outputting the excitation light, wherein the deflection unit is arranged in the beam paths between the filter unit and the output.