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Details of Grant 

EPSRC Reference: GR/H66419/01
Title: FEMTOSECOND SPECTROSCOPY OF CONJUGATED POLYMERS
Principal Investigator: Friend, Professor Sir R
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department: Physics
Organisation: University of Cambridge
Scheme: Standard Research (Pre-FEC)
Starts: 01 January 1993 Ends: 30 April 1995 Value (£): 153,621
EPSRC Research Topic Classifications:
Materials Characterisation
EPSRC Industrial Sector Classifications:
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Summary on Grant Application Form
The aim of this project is to develop the femtosecond laser facility that we have established in the Cavendish and to use it to obtain measurements of transient optical and electrical responses in a range of conjugated polymers synthesised in the Department of Chemistry in Cambridge in the group of Dr A B Holmes. The present laser system comprises a mode-locked Nd:YAG laser which synchronously pumps a dye laser to produce 100fsec pulses at 630nm. These short pulses can be amplified using an amplified chain pumped by the doubled output from a regenerative Nd:YAG laser at 1 kHz and the amplified pulses can be used to generate a white light continuum. Developments will improve signal acquisition, reamplify the continuum for frequency-selective pumping, and improve laser stability. Measurements of transient absorption, luminescence and photoconductivity will be made on a range of poly(arylenevinylenes). These will give information about charge separation and exciton formation at very short times, and the evolution of bipolarons and triplet excitons at longer times.
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Organisation Website: http://www.cam.ac.uk