Lens


The lens module is used for various experiments, such as the Michelson interferometer. Depending on the application, modules with different focal lengths can be combined. The background to this can be found on the respective pages for the experiments.

On this page you will find information about the assembly, special features and the possible experiments.

Assembly

Exploded View

  • 01A_Go_V*_cube_base 1×1
  • 02A_Br_V*_cube_cover 1×1
  • 13A_Si_V*_lens_holder
    • or 13B_Si_V*_lens_holder_f=15mm
    • or 13C_Si_V*_lens_holder_f=26,5mm
    • or 13D_Si_V*_lens_holder_f=65mm
  • 1x Lens
    • f=15mm & ø=16,5 mm
    • or f=26,5 mm & ø=15 mm
    • or f=65 mm & ø=16,5 mm
  • 4x Allen cylinder head screw, M3x12
Tools:
  • Allen key – 2,5 mm
  • (3D printing tool for lens insertion)

The lens tool can help to keep the four holding arms apart to make it easier to insert the lens.

3D printing tool for lens insertion

You will also find detailed instructions for assembly as well as a component and material list with the STL files for 3D printing and links to the relevant stores.

Special Features

Different Lenses

Various lenses can be constructed for the experiment kit. Different lenses are required depending on the experiment. The choice of focal length influences the size of the interference pattern and the distance at which it forms. Due to the dimensions of the kit, the following lenses are recommended for the experiments:

  • f=15 mm: Due to its short focal length, this lens is used in the Michelson interferometer (including with a piezo) and in the Sagnac interferometer, as the interference pattern is already formed at a short distance from the lens. Due to the dimensions of the experiment kit, the lens module is rotated using assembly so that the lens holder is on the side facing the light source.
  • f=26,5 mm: This lens is suitable for the Mach-Zehnder interferometer. A slightly longer focal length is advantageous here, as the interference pattern forms at a greater distance and can thus be observed more easily. Due to the dimensions of the experiment kit, the lens module is rotated during assembly so that the lens holder is on the side facing the light source.
  • f=65 mm: This lens is primarily used in experiments with an LED. Since LED light is less strongly focus than laser light, this lens ensures a good image. Due to the longer focal length, care should be taken to maintain a sufficient distance from the angle scale, for example.

Experiments