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Details of Grant 

EPSRC Reference: GR/N39135/01
Title: POWER-SCALING OF TWO MICRON SOLID-STATE LASERS VIA RADIATION COOLING
Principal Investigator: Clarkson, Professor WA
Other Investigators:
Hanna, Professor DC Nilsson, Professor LJA Grudinin, Dr A
Researcher Co-Investigators:
Project Partners:
Department: Optoelectronics Research Ctr (closed)
Organisation: University of Southampton
Scheme: Standard Research (Pre-FEC)
Starts: 01 March 2001 Ends: 30 November 2004 Value (£): 285,745
EPSRC Research Topic Classifications:
Lasers & Optics
EPSRC Industrial Sector Classifications:
Aerospace, Defence and Marine
Related Grants:
Panel History:  
Summary on Grant Application Form
This proposal will investigate power-scaling of two micron solid-state lasers by employing a novel hybrid laser scheme which combines the advantages of cladding-pumped fibre lasers and conventional bulk solid-state lasers. This will involve the development of a high-power diode-pumped thulium-doped silica fibre laser, which will be used to pump, in-band, a Ho:YAG laser operating around 2.1 microns. The combination of low quantum defect heating and mode area scalability in the bulk Ho:YAG laser are very attractive for high-power and high-brightness operation. A further attraction of Ho:YAG is the very long fluorescence lifetime of approximately 8ms, offering the prospect of very high Q-switched pulse energies for modest pump powers. An important aim of this project will be to explore the possibility of a further reduction in heat generation in the Ho:YAG via the use of radiation cooling, by anti-Stokes fluorescence, to offset the heat generation in the Ho:YAG via the use of radiation cooling, by anti-Stokes fluorescence, to offset the heat generated by the Stokes shifted stimulated emission. If a significant reduction in thermal loading can be achieved via this technique, then this would be an extremely important development in the power-scaling of lasers, allowing two-micro hybrid lasers to challenge the long-established dominance of one micron Neodymium and Ytterbium lasers in the high power regime.
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Further Information:  
Organisation Website: http://www.soton.ac.uk