Measuring aspheres quickly: tilted wave interferometry

Measurement of aspheres and free-form surfaces with the Tilted-Wave-Interferometer

Beat wave interferometry for measuring relative motion.

A new approach to detecting relative motion is proposed based on measuring the beat frequency. A formula is derived for the beat frequency as a function of the speed of translation. A principal sketch of an experimental setup implementing the new idea is proposed, and the effects of possible small differences in the frequencies and phases of the sources are discussed.

Internal wave interferometry.

Internal waves are a ubiquitous and significant means of momentum and energy transport in the oceans, atmosphere, and astrophysical bodies. Here, we show that internal wave propagation in nonuniform density stratifications, which are prevalent throughout nature, has a direct mathematical analogy with the classical optical problem of a Fabry-Perot multiple-beam light interferometer. We rigorousl...

Diffusing-wave interferometry

In this note we describe a qualitatively different approach to measure the temporal correlation functions of multiply scattered light from fluctuating dense random media. Our approach combines diffusing-wave spectroscopy with Micbelson interferometry. Among other things, the new approach should enable experimenters to perform correlation measurements on very short time scales. The method is des...

Attosecond electron wave packet interferometry