Beam splitter and arrangement for examining a sample which can be excited by means of electromagnetic radiation

An arrangement for examining a sample which can be excited by means of electromagnetic radiation, comprising:

• a first dichroic beam splitter comprising a first prism and a second prism connected to one another on base surfaces thereof, and a first dichroic layer arranged between the base surfaces of the first and second prisms, wherein an entry surface of the first prism forms an angle (β) in the range from 10° to <40° with the first dichroic layer;
• a second dichroic beam splitter comprising a third prism and a fourth prism connected to one another on base surfaces thereof, and a second dichroic layer arranged between the base surfaces of the third and fourth prisms, wherein an entry surface of the third prism forms an angle (β) in the range from 10° to <40° with the second dichroic layer;
• a light source for providing electromagnetic radiation suitable for excitation of the sample, wherein the electromagnetic radiation is coupled into the entry surface of the first prism and wherein at least a part of the electromagnetic radiation from the light source is reflected on the first dichroic layer in the direction of the sample, which is positioned downstream of an exit surface of the first prism;
• and
• a first detector for detecting electromagnetic radiation emitted by the sample, the emitted radiation passing through the first dichroic beam splitter, onto a measurement surface of the second prism, impinging upon the second dichoric layer, and at least a portion of the emitted radiation is transmitted through the second dichroic layer to the detector.