Wave matching of femtosecond and picosecond photon echoes in dye-doped polymer films

Zuikov, V.; Ferri, W.; Ollikainen, O.; Rebane, A.; Wild, U. P. (1996). Wave matching of femtosecond and picosecond photon echoes in dye-doped polymer films. Laser Physics, 6 (4), 729-734.
ajakirjaartikkel
Zuikov, V.; Ferri, W.; Ollikainen, O.; Rebane, A.; Wild, U. P.
  • Inglise
Laser Phys.
Laser Physics
1555-6611
1054-660X
6
4
1996
729-734
Ilmunud
1.1. Teadusartiklid, mis on kajastatud Web of Science andmebaasides Science Citation Index Expanded, Social Sciences Citation Index, Arts & Humanities Citation Index ja/või andmebaasis Scopus (v.a. kogumikud)
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English, We study experimentally two-pulse photon echo (2PPE) and the photochemically accumulated stimulated photon echo (PASPE) in organic dye-doped polymer films at low temperature as a function of the angle between the excitation pulses in transmission and reflection geometry. In the transmission geometry, by increasing the angle between two high-intensity femtosecond excitation pulses, we observe a blue shift of the 2PPE spectral profile, which we explain as wave-matching condition between the ultrashort excitation pulses and the emitted nonlinear coherent transient response. In the case of PASPE with low-intensity picosecond pulses, no spectral shift is observed, which is the result of the linear nature of the coherent transient response at small excitation intensities.
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