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Details of Grant 

EPSRC Reference: GR/K79109/01
Title: THE TEMP PROFILE IN HIGH-POWER DIODE LASERS AND ITS INFLUENCE ON EFFICIENCY AND LIFETIME.
Principal Investigator: Adams, Professor A
Other Investigators:
O'Reilly, Professor E
Researcher Co-Investigators:
Project Partners:
Department: Physics
Organisation: University of Surrey
Scheme: Standard Research (Pre-FEC)
Starts: 26 June 1996 Ends: 25 September 1999 Value (£): 146,295
EPSRC Research Topic Classifications:
Optoelect. Devices & Circuits
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:  
Summary on Grant Application Form
We have developed a new technique at Surrey to measure the temperature, T, of the active region of a normally mounted and bonded quantum-well semi-conductor laser by analysing the spontaneous emission spectrum from the end facet. It allows T to be determined as a function of distance along the cavity and has enabled us to measure the increased temperature of the facet of high-power visible lasers up to and beyond COD. We now wish to extend the work to try to understand the catastrophic degradation mechanism and to investigate internal, thermally activated leakage currents. We will relate the results to strain distributions within the device and to facet coating techniques. We wish also to apply the technique, for the first time, to long wavelength lasers where internal heating leads to roll-off in the light-current characteristics, and limits the maximum power output. We will relate the results to internal loss processes which are also being studied under grant GR/K10775 in order to predict better high-power laser structures.
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Organisation Website: http://www.surrey.ac.uk