Marek Samoc et al 1997 J. Phys. D: Appl. Phys. 30 895 doi:10.1088/0022-3727/30/5/023
Photocurrent autocorrelation of femtosecond laser pulses in poly( p-phenylenevinylene)
Marek Samoc, Anna Samoc, Barry Luther-Davies, Annette Dowd and Matthew McDonnell
Show affiliationsPhotoconductive thin-film cells made from a 
-conjugated polymer, poly-(p-phenylenevinylene) (PPV) can be used for diagnostics of femtosecond laser pulses utilizing the phenomenon of photocurrent autocorrelation. In general, the autocorrelation photocurrent signal can be due to the nonlinearity of the primary photogeneration step or to the influence of the existing photogenerated charge carriers on the efficiency of production of further amounts of charges. Experiments with 150 femtosecond pulses from a Ti - sapphire laser at 800 nm show that two-photon induced photocarrier generation is the nonlinear process leading to the autocorrelation in PPV photoconductive cells. There is no indication of the presence of any photogeneration intermediates with picosecond range lifetimes.
- PACS
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85.60.-q Optoelectronic devices
73.50.Gr Charge carriers: generation, recombination, lifetime, trapping, mean free paths
72.40.+w Photoconduction and photovoltaic effects
73.50.Pz Photoconduction and photovoltaic effects
42.55.Rz Doped-insulator lasers and other solid state lasers
- Subjects
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Condensed matter: electrical, magnetic and optical
- Dates
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Issue 5 (7 March 1997)
Received 27 August 1996, in final form 12 November 1996
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Photocurrent autocorrelation of femtosecond laser pulses in poly( p-phenylenevinylene)
Marek Samoc et al 1997 J. Phys. D: Appl. Phys. 30 895
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