Description

A Fabry Perot Interferometer is an optical interferometer in which a beam of light undergoes multiple reflections between two reflecting surfaces and its resulting optical transmission (or reflection) is periodic in wavelength. The Fabry – Perot design contains plane surfaces that are partially reflecting so that multiple rays of light are responsible for the creation of the observed interference patterns. For high resolution spectroscopy, where a resolution in the range of MHz to GHz is required, a Fabry – Perot interferometer (FP) is used.

In Fabry – Perot interferometer, the distance between the partially reflecting mirrors are varied by using coarse and finely adjustable translation stage driven by micro-meters. One mirror is fixed and the other is mounted on the translation stage through a kinematic mount. This two axis kinematic mount is used to correct the parallelism between beam splitter.

Experiment Performed

• To find wavelength of laser source.
• To find the Spacing between two mirrors by using fringes.
• To find the Finesse and Free Spectral Range of the Etalon.

Feature

• Precision design of optical components
• Well polished Mirrors
• Easy to operate
• Extended durability
• Corrosion free mechanical assembly