A brief description of the optical path of differential interference microscope

Non-polarized light, through the 45-degree polarizer, and then through the prism, is divided into two perpendicular to each other polarized light, and then through the condensing lens, the light to the sample & carrier stage, after the sample role, the light has undergone a phase shift, and then through the objective lens condensing lens of the convergence, and then to the prism, the prism will be perpendicular to each other to re-combine into the same direction of polarization (the phase difference is converted to the) amplitude), that is, 135-degree polarization direction, which causes light interference, resulting in image enhancement or darkening, depending on the optical range difference, and then through the 135-degree polarizer, to remove the directly transmitted light.