Effect of Pressure on Fabrty- Perot Interferometer Fringes Pattern.
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Abstract
A design and construction of Fabry -Perot Interometer system were achivcd to spcify and calculate wavelengths to the neart nanometers for spectroscopic research investigation, this accuracy required for as the refractive index is a function of pressure on the medium when the space between the two windows is keptn constant .
He-Ne laser (632.8) nrn and the green laser (532) nm were used as
coherent sources.
Lasers of (632.8) & (532)nm respeCtively, were used as coherent sources. Results showed accuracy of (0.2)nm in determining the wavelength when (lOO) mm Hg difference in pressure was applied . The wavelength and the refractive index were calculated when prcesure was varied the rough Fabrt -Perot interferometer for bth wavelengths.