1,721,073 research outputs found
Optically pumped mid infrared laser action in the monohaloacetylenes
No full textStrong optically pumped laser action excited by a TEA carbon dioxide laser has been obtained from monofluoro-acetylene in the 560-610cm region with outputs of up to 25mJ and superfluorescent operation readily achieved without optimisation. These result from excitation of a combination of the two bending modes v4+v5. Laser action was also obtained with 9µm excitation of the v3 C-F stretch, on a difference band terminating in v4, with similar properties. Lasers of this type are rare. As well as being a potentially useful laser source in a region sparsely populated with good lasers, the results are of interest in the context of on going investigations of the spectroscopy of HCCF. Most, but not all lines are assigned. Very weak, erratic laser action was observed from chloro- and bromo-acetylene
The laser - light fantastic
No full textLasers are now vital in everyday life - used in your computer, your CD player, in medicine and every time you pick up a telephone. Yet once they were said to be a 'solution' without a problem. The talk explains the basic operation of the laser and explores the very wide range of laser types. It also illustrates the wide variety of uses the laser is now put to
Letter: Comment on the paper "Etalon effects in laser mirrors" [see Optical Engineering 33(11) 3826-3827 (Nov 1994)]
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Optoelectronics and The Internet
No full textThe talk introduces the concept of Optoelectronics, the fusion of optics and electronics which is now absolutely vital to modern communications, in particular the Internet. The basic ideas of the scale of information which the modern world needs to transmit, and the speeds at which we must transmit it, are discussed to introduce the requirements of modern high-bandwidth links. The physical basis of those links, the fibre optics, optical amplifiers and dispersion compensation systems essential to its operation, are introduced at a basic, non-mathematical level. Some of the new developments required by the ever growing thirst for data communications, and approaches to them underway at the University of Southampton, are included in the talk. It is intended to be suitable for students typically in their last two years or schooling pre University, and to non-specialist year University students. It may also be of interest to persons with a general interest in modern IT, and assumes only a general technical background with no specialist knowledge of the subject
Using a Helium Ion Microscope in a Clean Room Environment
No full textThe Zeiss 'Orion' helium ion microscope has improved resolution and sample interaction mechanisms as compared to a standard SEM. To fully realize the potential of the device in the new Southampton Nanofabrication Centre it was installed in a class 1000 area co-sited with a FIB and adjacent to the high resolution e-beam class 100 facility and extensive lithography and layer deposition tools. Achieving an adequate acoustic environment has required numerous modifications to the clean room infrastructure. The paper provides details of our multi-facetted, clean room compatible approach to resolving these multiple practical issues
Technical Note 02-053: The thermal conductivity of macor at intermediate cryogenic temperatures
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