Michelson-Interferometer: Determining the Wavelength of Light (ISE)

With this interactive screen experiment it is possible to determine the wavlength of the laser used in this experiment

The Michelson-interferometer

In the experiment, the coherent light of a laser (bottom picture, left) enters the Michelson-interferometer (bottom, middle). The interferometer is composed of a beam splitter (right, blue component) that splits the laserbeam up into two partial beams. The first one of those goes to the fixed mirror (right, lower part), is reflected there and passes the beam splitter again. Now it leaves the interferometer and is projected on the screen (bottom, center and left detail).
The second part of the beam is reflected by a mirror (right, right) whose position can be adjusted by a micrometer-screw (bottem, right detail). It also passes the beam splitter again and one sees the resulting interference pattern on the screen.
Using the ISE it is possible to vary the position of the adjustable mirror and thus the distance covered by the second part of the beam. This leads to a change in the phase difference. On the screen various maxima and minima can be seen as the mirror is moved.

Determine the wavelength of the used laser by varying the position of the second mirror and counting the phase shifts in the interference pattern.

Move the mouse while pressing the left button to adjust the position of the movable mirror.
The counter shows the position of the mirror in reference to the starting position.
(Due to the size of the ISE (1.2 MB) loading times may be long! The progress bar does not work correctly!)