| EPSRC Reference: |
GR/R19298/01 |
| Title: |
High Pressure Studies of Quantum Cascade Lasers |
| Principal Investigator: |
Murdin, Professor BN |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| 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
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| EPSRC Research Topic Classifications: |
| Optoelect. Devices & Circuits |
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| EPSRC Industrial Sector Classifications: |
| Communications |
Electronics |
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| Related Grants: |
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| Panel History: |
| Panel Date | Panel Name | Outcome |
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03 Oct 2000
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Photonics & Photonics Materials
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Deferred
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Summary on Grant Application Form |
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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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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.surrey.ac.uk |