LEGO Interferometer Manual

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.
Abbildung 1: Das Interferometer aus LEGO-Steinen.
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?)
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.

0. ASSEMBLY

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