Comparison between optical nonlinearity relaxation times from coherent second‐harmonic generation and from incoherent hyper‐Rayleigh scattering

Autor:	Geert Olbrechts, Koen Clays, André Persoons, Naoki Matsuda, Erik J. H. Put
Rok vydání:	1996
Předmět:	Physics Physics and Astronomy (miscellaneous) business.industry Scattering Relaxation (NMR) Second-harmonic generation Nonlinear optics Intensity (physics) law.invention symbols.namesake Optics law Femtosecond symbols Atomic physics Rayleigh scattering business Waveguide
Zdroj:	Applied Physics Letters. 69:4145-4147
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.117841
Popis:	Femtosecond hyper‐Rayleigh scattering has recently been used to determine the spatial correlation length between nonlinear optical chromophores in polymer films [G. Olbrechts et al., Chem. Phys. Lett. 253, 135 (1996)]. This correlation length corresponds to the effective interaction length for frequency doubling in waveguide format, as derived from phase‐matching curves. The temporal characteristics of this correlation length have now been studied and compared with thermal relaxation times, obtained with coherent second‐harmonic generation. The correlation length decays much faster than the second‐harmonic intensity, indicating that the efficiency of a second‐order waveguide process could decay much faster than generally anticipated.
Databáze:	OpenAIRE
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