To access the green spectral range for display applications, high-power optically pumped semiconductor disk lasers (OPSDLs) in combination with second-harmonic generation have been realized. A frequency-doubled output exceeding 9.5W is achieved at a wavelength of 520 nm. The wavelength of these devices can be tuned over a rather broad range of more than 20 nm in the second-harmonic regime. In t...

It is beyond contention that the power of organised labour in Britain has witnessed a marked fall in the last thirty years. Attempts to rebuild that powerbase in a world of neo-liberal globalisation and the ascendancy of employer power means that it is time to go back to basics to try to understand the theoretical sources of labour union power. Using a simple three-fold schema developed by Eric...

This report is a discussion, evaluation and comparison of potential sources of electrical power for small mobile systems. Power sources are an inevitable challenge in the design of portable and small mobile systems, especially robotic systems. Power systems cannot be an afterthought and, if left to final design stages, can result in severe and adverse effects on the system, such as excess weigh...

Recent advances in measurement technology have made it not only possible to measure stability margins, but made it a quick and simple process. On power sources with remote voltage sensing terminals, gain and phase margins can usually be determined in a few seconds without even removing the cover. These measurements can be made while the source is operating normally, supplying power to the real ...