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Journal articles
Nonresonant four wave mixing in photorefractive CdTe crystals using a picosecond parametric generator
Abstract : We demonstrate that a parametrically pumped picosecond laser has enough coherence and energy to write transient phase gratings at nonresonant interaction, thus allowing a study of time-resolved carrier transport in CdTe crystals to be made. Autocorrelation trace of light diffraction efficiency on transient grating allowed us to measure a coherence length of the parametric generator. Carrier diffusion, recombination, and drift in light-created internal space-charge ~SC! electric fields have been studied in vanadium or germanium doped semi-insulating CdTe crystals by nonresonant four-wave mixing technique at 940 nm wavelength. It was found that modification of the deep level charge state in CdTe:V by As codoping has changed the sign of majority carriers, responsible for the creation of SC field. Dynamics of free carrier grating decay in CdTe:Ge revealed an electron-governed very fast initial grating decay which develops with time into the double-exponential hole-governed grating decay. Time-resolved transient grating technique described in this article provides a powerful tool for investigation of the role of deep traps in photorefractive semiconductors and optimization of their photoelectric properties in a required temporal and spectral range
Cited literature [3 references]
https://hal-iogs.archives-ouvertes.fr/hal-00673495
Contributor : Marie-Laure Edwards <>
Submitted on : Thursday, February 23, 2012 - 4:43:02 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:39 PM
Long-term archiving on: : Wednesday, December 14, 2016 - 8:00:55 AM
Contributor : Marie-Laure Edwards <>
Submitted on : Thursday, February 23, 2012 - 4:43:02 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:39 PM
Long-term archiving on: : Wednesday, December 14, 2016 - 8:00:55 AM
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PhD1-30.pdf
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