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Details of Grant 

EPSRC Reference: GR/R15191/01
Title: Stimulates Emission and Lasing Processes In Inga(Ai)N Quantum Well Heterostructures
Principal Investigator: Fox, Professor AM
Other Investigators:
Mowbray, Professor D Skolnick, Professor M
Researcher Co-Investigators:
Project Partners:
Department: Physics and Astronomy
Organisation: University of Sheffield
Scheme: Standard Research (Pre-FEC)
Starts: 30 June 2001 Ends: 29 August 2004 Value (£): 211,213
EPSRC Research Topic Classifications:
Optoelect. Devices & Circuits
EPSRC Industrial Sector Classifications:
Electronics
Related Grants:
GR/R15184/01
Panel History:  
Summary on Grant Application Form
This collaboration between Cardiff and Sheffield aims to obtain a comprehensive understanding of the stimulated emission and lasing processes in InGaN-GaN quantum wells. This physics underpins the operation of nitride laser diodes, but its present status lags seriously behind the device technology. We will carry out a systematic programme of complementary studies on custom-designed samples now available from the Central III-V Facility. This is expected to establish a strong UK presence in the competitive field of GaN laser physics, by providing a definitive body of knowledge beyond the capabilities of either group alone.At Sheffield, we will use high energy ultrafast blue pulses from a Ti:sapphire regenerative amplifier to study the carrier dynamics at high excitation densities on a femtosecond time scale. The transient absorption spectra will be recorded using white light pump-probe spectroscopy, while the simultaneous time-resolved photoluminescence spectra will be measured by up-conversion. This will allow us to study the dynamics of stimulated emission and optically-pumped lasing, together with transient field screening, carrier capture and carrier trapping effects. CW spectroscopy using p-i-n structures will be used to provide a series of well characterised samples as a reliable basis for the ultrafast studies, and for the gain studies at Cardiff.
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Further Information:  
Organisation Website: http://www.shef.ac.uk