It is now possible to exercise a high degree of control over the velocity at which light pulses pass through material media. This velocity, known as the group velocity, can be made to be very different from the speed of light in a vacuum c. Specifically, the group velocity of light can be made much smaller than c, greater than c, or even negative. We present a survey of methods for establishing...

The main drawback of this method is that for typical path lengths possible in a crowded laboratory, very high frequencies are required to produce measurable phase shifts. This requires the use of specialized and expensive oscilloscopes to display the waveforms. The system used here, however, uses a mixing technique which allows the phase shift between high frequency signals to be observed on a ...

In the framework of linear transformations between inertial systems, there are no physical reasons for assuming any anisotropy in the one-way velocity of light. Pacs 03.30 Special relativity

In this study, a white light particle image velocimetry (WL PIV) system which employs a light sheet generated with a flash was used. The system was developed in order to provide a cost-efficient and safe alternative to laser systems while keeping the accuracy limits required for hydraulic model tests. To investigate the accuracy of WL PIV method under different flow conditions, experiments were...