In Fabry-Perot interferometer (Model: HO-ED-INT-10), the distance between partially reflecting mirrors are varied by using coarse and fine translation stage driven by micrometers in order to get precision measurements. One beam splitter is fixed and the other is mounted on a translation stage through a kinematic mount. A translucent screen is provided with vernier and needle to take the readings of the fringes directly.

Translation stages are fitted with micrometers for both coarse and fine movements in order to get precision measurements. All components and modules are mounted on rail and carriage system for easy adjustments. The optics and mechanics used are of research quality. The mechanical assembly is made out of corrosion free materials.

The enclosed air gap generally varies from several millimeters to centimeters when the device is used interferometrically. If the gap can be mechanically varied by moving one of the beam splitters, the device is referred to as an interferometer. Its transmission spectrum as a function of wavelength exhibits peaks of transmission corresponding to resonances of the etalon.