Measuring device (1c, 1d) for biological components for measuring a component using
heat generation of a biological sample (5) that absorbs excitation light (17), wherein the measuring device (1c, 1d) for biological components has the following: an
optical medium (10) which has a sample
support surface (12) on which the biological sample (5) is arranged, wherein the
optical medium (10) is transparent to the excitation light (17) and is made of
chalcogenide glass which has a lower
thermal conductivity than
zinc sulfide, and a
refractive index of the
optical medium (10) is changed by the
heat generation of the biological sample (5) which absorbs the excitation light (17); an excitation
light source (16) for emitting the excitation light (17), which moves through the optical medium (10) in the direction of the sample
support surface (12); a scanning
light source (20) for emitting scanning light (21) which moves through the optical medium (10), a light
position detector (25) for detecting the position of the scanning light (21) emerging from the optical medium (10), and a temperature sensor (35) for measuring the temperature of the optical medium (10), wherein the optical medium (10) is also transparent to the scanning light (21), wherein the light
position detector (25) detects a first position (22a) of the scanning light (21) exiting the optical medium (10) when the excitation
light source (16) does not emit excitation light (17), and a second position (22b) of the scanning light (21) exiting the optical medium (10) in which a
refractive index gradient region (18) is generated by the
heat generation caused by the excitation light (17) when the excitation light source (16) emits the excitation light (17), where the component is measured based on the first position (22a) and the second position (22b), and wherein the temperature sensor (35) is attached to an area of the sample
support surface (12), wherein the area is away from the biological sample (5), the excitation light (17) and the scanning light (21).