Abbildung 1: Das Interferometer aus LEGO-Steinen.
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LEGO-Interferometer
INTRODUCTION
The interferometer built from LEGO-bricks was developed for usage in
schools. All parts can be build by students using LEGO-manuals in about
15 minutes.
This manual will describe how the additional
optical components
can
be added to the LEGO-construction. In addition to that, the calibration
process of the interferometer is explained.
PREPARATION
Function of a Michelson interferometer.
Mathematical relation between the wavelength of light and the
translation of the mirror (see the end of this manual).
COMPONENTS
LEGO-bricks
or
already built components
1x Hama Laserpointer LP18
2x Front surface mirror 30mm x 20mm,
1x Semi-transparent front surface mirror
Glass lens, diameter
d
=18mm,
f
=26,5mm
Hexagon screw M5 x 40mm
Rubber bands
IMPORTANT INFORMATION
Before adding the parts, please be aware that the optical components
are very prone to damage and therefore have tob e handled with care.
The quality of the interference patterns will be disrupted by
fingerprints on the lens or the mirrors. The experiments use front face
mirrors (
why?). These are coated and the coating should not be
touched if possible. Cleaning of the optical components is not to be
done by using common handkerchiefs (
why?)
0. ASSEMBLY
Build the components of the LEGO interferometer by using manuals 1-
4.
Should the components already be assembled, please connected
them as shown in figure 1
and continue with the steps for adding the
optical components.