Use of a double - - michelson interferometer in an arrangement for determining the refractive index photo-thermal

摘要

The light beam is radiated back by the focussing optic (3) and the double Michelson interferometer (2) in to an evaluation unit (10). The radiated back light beam interferes with a reference beam in the double Michelson interferometer. In the interferometer, a part with an unaltered and a part with a phase shifted at a constant angle are superimposed. Also provided is an excitation laser (9), the light beam of which irradiates successively a further focussing optic (7) and the microcuvette (5).