Interferometry

Michelson Interferometer

Interference Pattern

Fabry-Perot Interferometer

Time for preparing an experiment is very short: The adjusted Interferometer can be stored in the solidly built box. For an experiment only the micrometer has to be swang out and a He-Ne-laser has to be placed in front of the divergence lens.
Due to given component positions the assembly for all experiments can be done easily.
Due to the reflecting screen the experiments can be carried out at daylight (no direct solar radiation).

Experiments (a He-Ne-laser is necessary in addition):

¹ with Accessory Kit, 650266: vacuum cell and a glass plate mounted on a rotating holder
² simple vacuum pump necessary

Features:

Heavy (5,5 kg), rigid (thickness 25 mm) and large (245 mm x 330 mm) base made of black anodized aluminium.
Large optical components: beam-splitter diameter = 40 mm, mirrors = 40 mm x 40 mm.
precision beam splitter: flat to 1/10 wavelength (frontside) and 1/4 wavelength (rearside).
User friendly mirror movement due to an eccentric gear control. One division mark at the micrometer corresponds to a mirror movement of roughly 10 nm. The exact ratio is signed individually on each interferometer. With the given ratio the wavelength measurements are exact to at least ±5%.

Instruction sheet including examples and physical background: Interferometer-en.pdf (511 kB)

Instruction sheet including examples and physical background: Fresnel-Mirror.pdf (130 kB)

for positioning standard slides (50 mm x 50 mm, max. 4 mm thick) in the optical axis
height of the slide centre over shaft end = 150 mm (standard height)
rotating range -90° to +90°, scale division in 5° steps
screen diameter = 130 mm, hole = 44 mm
shaft diameter = 10 mm
a slide with a thickness of 3 mm is exactly above the middle of the shaft