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Details of Grant 

EPSRC Reference: GR/M83964/01
Title: HIGH-POWER, ND-INDIFFUSED-YVO4, TAPERED WAVEGUIDE LASERS
Principal Investigator: Shepherd, Professor DP
Other Investigators:
Wilkinson, Professor JS Harris, Dr R Tropper, Professor A
Researcher Co-Investigators:
Project Partners:
Department: Optoelectronics Research Ctr (closed)
Organisation: University of Southampton
Scheme: Standard Research (Pre-FEC)
Starts: 13 January 2000 Ends: 12 January 2003 Value (£): 50,333
EPSRC Research Topic Classifications:
Optical Devices & Subsystems
EPSRC Industrial Sector Classifications:
Electronics No relevance to Underpinning Sectors
Related Grants:
Panel History:  
Summary on Grant Application Form
Compact laser sources of high average power and good beam quality are needed for a variety of industrial, medical and research applications. This has inspired work on diode-bar-pumped waveguide lasers, as planar waveguides are compatible with the asymmetric beam-shpae of diode-bars, leading to highly-compact coupling schemes. However, the output of the waveguide laser is far from diffraction-limited in the non-guided plane because of the broad gain region and the use of short monolithic resonators. Here we propose to develop adiabatic waveguide tapers that couple the planar diode-bar-pumped region to a single mode channel section, leading to near-diffraction-limited output. A low-loss taper design can expand up to 200um in a few cm. This is compatible with diode-bar side-pumping if a material with a strong absorption for the diode emission is used. For this reason we propose to develop Nd-indiffused waveguide fabrication in Yttrium Vanadate. This will require a study of the diffusion characteristics and waveguide fabrication in this important material, the fabrication of efficient adiabatic tapers, and an initial demonstration of high-power diode-pumped laser operation. The high quality research supported by this grant, together with training of a PhD student, will make a strong contribution to the UK standing in this competitive area.
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Organisation Website: http://www.soton.ac.uk