Experiments on the Porch Swing Bearing of Michelson Interferometer for Low Resolution FTIR

Figure 9

Measurement setup for determining the modulation depth of the output beam of the interferometer. The beam from Helium-Neon laser was collimated in C and then pointed through the Michelson interferometer built from plane mirrors M1 and M2 and a cube beam splitter BS. The mirror M2 was rigidly mounted and the mirror M1 was moved using the porch swing bearing. The converging lens L was used to focus the beam on the photodiode D.