| EPSRC Reference: |
GR/K88002/01 |
| Title: |
TEMPORAL AND SPECTRAL DYNAMICS OF PHONONS IN CRYSTALS EXCITED USING SUBPICOSECOND OPTICAL PULSES. |
| Principal Investigator: |
Han, Dr T |
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| Department: |
Physics |
| Organisation: |
University of Strathclyde |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
13 March 1997 |
Ends: |
12 March 1999 |
Value (£): |
195,525
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Summary on Grant Application Form |
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The ultimate goal of this proposal is to make time-resolved measurements of vibrational relaxation in laser gain media. To facilitate such measurements it is necessary to grow high quality crystals containing isoelectronic dopants V3+ and Cr4+ (3d2 configuration), Cr3+ and Mn4+ (3d3 configuration), Ce3+ (4fl) and Yb3+ (4f13) in appropriate halide, oxide and fluro-apatite crystals. These crystals will be characterised using optical absorption, photoluminescence and radiative decaytime measurements. A vibrational relaxation time spectrometer will be designed and constructed around a Coherent RegA 9000 Ti-sapphire system permitting pump-probe measurements of transient absorption using the optical Kerr effect. Pump beam pulses (50-100 fs) in the impulsive limit will be used to excite samples. The probe beam after passing through the sample and analysing polarizer will be detected using a spectrograph and OMA from which a 3 dimensional plot of the transient absorption versus wavelength and time will be recorded. These measurements should resolve whether coupling to local modes or to lattive phonons are important in non-radiative relaxation of selected photoexcited ions in laser crystal and give quantitative measurements of their associated energies and dynamics.
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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 |
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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.strath.ac.uk |