[转帖]HIGH POWER LASER TECHNOLOGY

zgzxb · 发表于 2003-4-27 08:55:00

HIGH POWER LASER TECHNOLOGY
AND APPLICATIONS
Professor R G Harrison
There is a rapidly growing interest in the use of pulsed gas lasers, in particular TE/TEA CO2, for a wide range of industrial and other applications. With this, there is a demand for improving the performance and extending the operational capability of these lasers beyond that provided by conventional self-sustained discharge technology. In industrial applications long life reliability and running costs are key issues for lasers, along with the requirements of operation at high repetition rate.

This programme of investigation jointly supported by EPSRC, British Aerospace, and formerly the European Space Agency concerns the development of TE/TEA CO2 lasers based on alternative discharge technology capable of operation at high pulse energy and high peak power.

This has led us to the innovation of a new magnetic pulser-sustained switching technology which has proved a most powerful approach in providing essentially infinite lifetime switching and considerably enhanced operational features of laser performance. Notably among these are high efficiency (50% over conventional systems), variable pulse width (1-5 µsec and longer), tailored pulse shape (flat top, etc.), low operating voltage (70% of conventional systems) and efficient helium-free operation, with the further merit of compact and rugged design and the use of remote power driving.

A unique feature of this stand-alone technology, that of eliminating the plasma switch from the main discharge path, is currently being exploited with the development of alternative compact all solid state (ASS) switching technology. This carries exciting prospects for the realisation of a new generation of high power/high repetition rate TE/TEA lasers based on all solid state switching, offering the greatly enhanced operational features detailed above. This work was the recent recipient of a DTI SMART award for innovation.

The potential impact of this programme is technological. They are presently being appraised for industrial applications including surface treatment of Al alloys for the aircraft industry with BAe, marking of cables with BICC and for art conservation and cleaning of historic buildings. Futher the laser technology has been prioritorized by ESA for a TEA CO2 transmitter for their ongoing programme on Space Borne Doppler Wind Lidar.

[转帖]HIGH POWER LASER TECHNOLOGY

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