| Summary: | The purpose of this study is to investigate the transmission curve of
multiple reflections, which is known as Fabry Perot interferometer based on
spherical and plane mirror separation. This multiple reflections of light should
occur between two high reflectance coefficients of parallel mirrors that are
named as cavity before they get to be transmitted. The transmitted rays along
the edge of secondary mirror were observed. The highest interference peak
occurs when they experienced same phase. These transmitted rays then were
scanned by periodic linear change in the Piezo voltage that had been set at 128
V and its frequency was tuned up to 100 Hz. Proper alignment on setup
arrangement and some modification of the system had been done and the
captured data effectively clarified by theoretical approach. The cavity was
fixed set as the radius of curvature for confocal measurement; there were 75
mm and 100 mm whereas for plane parallel distance was set from 250 mm of
separation until 400 mm improved by 50 mm every increment. Free spectral
range parameters for confocal separations were 166.551 MHz per division for
75 mm and 124.914 MHz per division for 100 mm separation. Based on the
waist of the Gaussian beam, the slimmer of full wave half maximum was
owned by the separation of 75 mm. Based on high reflectance coefficient, the
calculated value of finesse was 76.953. More difficult adjustment had been
encountered while testing the plane parallel mirror. The more sensitive,
probably in micro meter changed, opto-mechanical system on the piezo
electric scanning should be required.
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