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We demonstrate an experimental setup utilizing fiber-optic detection and coupling of scattered light into existing photon correlation spectroscopy (PCS) and Fabry–Perot (F–P) interferometry systems. The performance of the fiber coupled F–P as a high-resolution interferometer is considered in detail. Several practical issues and limitations are discussed, including the selection of optic and fiber-optic components, collimation, effects of the fiber mode structure and core diameter, and alignment issues. A series of test measurements on standard systems with well known properties shows that the proposed fiber-optic design meets the performance expectations for both PCS and F–P instruments and presents an attractive alternative to the classical pinhole design. [ABSTRACT FROM AUTHOR]

The shot-noise limit to the sensitivity of ellipsometric phase shift measurements with a laser beam power of a few mW is of the order of 10-9 rad. An apparatus is described that realizes shot-noise-limited performance for dc Kerr effect birefringence measurements. [ABSTRACT FROM AUTHOR]