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Details of Grant 

EPSRC Reference: GR/R19298/01
Title: High Pressure Studies of Quantum Cascade Lasers
Principal Investigator: Murdin, Professor BN
Other Investigators:
Adams, Professor A O'Reilly, Professor E Lancefield, Dr D
Researcher Co-Investigators:
Project Partners:
Thomson Csf-Lcr Universite de Neuchatel
Department: Sch of Electronics & Physical Sciences
Organisation: University of Surrey
Scheme: Standard Research (Pre-FEC)
Starts: 01 October 2001 Ends: 31 December 2004 Value (£): 205,918
EPSRC Research Topic Classifications:
Optoelect. Devices & Circuits
EPSRC Industrial Sector Classifications:
Electronics Communications
Related Grants:
Panel History:
Panel DatePanel NameOutcome
03 Oct 2000 Photonics & Photonics Materials Deferred
Summary on Grant Application Form
We propose to investigate the properties of quantum cascade lasers under high externally applied hydrostatic pressures. The application of pressure to individual devices gives information equivalent to that from a large range of samples of varying composition, and will be done using our He gas compressor. This allows low temperature pressure tuning up to 1GPa, mid- to far-infrared transparency, refractive index equivalent to air, and several mm long electrically pumped samples, all of which are essential for the project and unachievable with other systems. Objective 1 will be achieved by study of the effects of tunnelling and thermal excitation between the different valleys in GaAs/AlGaAs samples where the band offsets are low and the leakage consequently high. This will be deduced from the threshold current measured as a function pressure and temperature and comparison with the calculated leakage activation energy (i.e. the separation between the valleys). Objective 2 will be achieved by measurement of the laser characteristics as a function of pressure and the applied electric field using InGaAs/lnAlAs devices which are less affected by the leakage. The position and width of the electric field resonance can be compared with calculated sub-band line-up to see which of the various resonances are more important and how sharp they are. Finally Objective 3 will be achieved by feedback of the information gained from the other two Objectives into design of enhanced structures.
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Organisation Website: http://www.surrey.ac.uk