UFR PhITEMPhysics, Engineering, Earth, Environment, Mechanics

Interferogram of the yellow doublet of a Mercury vapor lamp (high-pressure) Recorded with a Michelson air knife, a photodetector placed in the center of the rings. This curve shows the light intensity measured as a function of time, with the moving mirror translated at constant speed. By clicking on the image, you can download a pdf file in which details of the experiment can be used to make measurements (mean wavelength, doublet deviation, line width).

Interferogram of the yellow doublet of a sodium vapor lamp (low-pressure) Same as above.

Interferogram of an incandescent lamp (with anti-caloric glass), without and with two types of yellow filters (color and interference filter). Same as above. We can estimate the bandwidth of the two types of filter.

Rings obtained with a Michelson (left) and Fabry-Pérot (right) interferometer, illuminated by a doubled YAG laser.. The presence of two modes with very close wavelengths is clearly visible with the Fabry-Pérot (split rings), but not with the Michelson.