Michelson interferometer : POD013495
Référence : POD 013 495
Principle : the Michelson apparatus is a dual beam interferometer: two beams generated by amplitude division can interfere.
One semireflecting plate, called separator, divides one incident light beam into two beams, of identical intensity.
Each beam is then reflected by a mirror.
At the interferometer output, both beams, which have an optical path difference depending on the distance & the angle between the mirrors, interfere ; generating therefore, an “interference pattern”.
One of the two mirrors is fitted on a trolley, which enables to vary the path difference, in rotating one micrometric screw. On the other hand, a complete set of screws, intended to adjust the plate & mirrors positioning.
Characteristics:
the Michelson interferometer is constituted of mirrors: Ø 40 mm, and glass plates Ø 80 mm, in order to ensure a better visibility of the interference gratings. Plates & mirrors are anti-reflection processed, and have flatness of Lambda/20.
The assembly is protected by infra red filter, Ø 50 mm. Screws & adjustment devices are made of stainless steel.
The fine adjustment is geared down by a torsion system. The translation plate is guided by ball bearing systems. The
motion range:
25 mm, is carried out by a micrometric screw with digital display (micrometric accuracy). The main plate is made of solid steel with anti-vibration feet.
The adjustment screw of the compensating device angle is external, giving better access. Anti-unscrewing stop ends are also fitted on the moving mirror adjustment screws.
Main experiments:
• Study of interference phenomena
• Wavelength measurement
• Speed of light calculation
• Study of fluted spectrum
• Measure of Sodium doublet
• Thin glass plate thickness meas.
• Medium index measurement
• Analysis & recording of interference gratings (motorized models).
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