A Field Compensated Interferometer for Wavelength Comparison
We have built at the Institut National de Métrologie (INM) a two beam interferometer, of Michelson type, for optical wave-length comparison. It is in vacuum and the separating plate works at Brewster’s angle. Its main quality is to give a flat field of interference at a path difference chosen for measurements (temporarily 250 mm), hence providing a large flux. The standard line of krypton provides a signal-to-noise ratio which allows us to work with a continuous scanning of path difference and a time constant less than 10−1 second.
KeywordsPhase Angle Path Difference Standard Line Flat Field Interference Field
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