Aspects of hole-burning and spectro-temporal holography in molecular doped solids (Review Article)

• Veröffentlicht in: Физика низких температур
• Datum: 2006
• 1. Verfasser: Jean-Pierre Galaup
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2006
• Schlagworte: Molecular Solids
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/120887
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Aspects of hole-burning and spectro-temporal
 holography in molecular doped solids
 (Review Article) / Jean-Pierre Galaup // Физика низких температур. — 2006. — Т. 32, № 11. — С. 1330–1344. — Бібліогр.: 67 назв. — англ.

The persistent spectral hole-burning (PSHB) phenomenon is known since 1974. It is still an
 important research area for the study of the intimacy of complex molecular systems in the solid
 state, revealing high resolution spectra, photophysics, photochemistry and dynamics of molecular
 doped amorphous media, organic as well as inorganic. From another point of view, PSHB allows
 the engraving of any spectral structures in the inhomogeneous absorption band profile of molecular
 doped amorphous hosts or ion doped crystals cooled down to liquid helium temperatures.
 Therefore, a PSHB material is programmable in the spectral domain and consequently it can be
 transformed in an optical processor capable to achieve user-defined optical functions. Some aspects
 of both fields are illustrated in the present paper. Concerning the search of efficient PSHB
 materials, the hole burning performances and the photophysics of polymer and xerogel based
 systems are compared. The problem of high-temperature persistent spectral hole-burning materials
 and the search for new frequency selective photosensitive systems for fast optical pulse processing
 at 800 nm are considered. Regarding the points treated, inorganic hosts based on silicate xerogels
 or porous glasses have shown the best results. Moreover, by combining inorganic and organic
 capabilities or by grafting organic species to the host, hybrid xerogels have not yet revealed all
 possibilities. Also, the interest of two-photon materials for engraving spectral features with
 near-infrared or infrared light is developed. As an introduction to possible applications of PSHB
 material, the basics of spectro-temporal holography are remembered and a demonstrative experiment
 using a naphthalocyanine doped polymer film is described, proving that the temporal
 aberration free re-compression of ultrashort light pulses is feasible, therefore opening a way for
 applications in ultrashort light pulse shaping. Aspects for a comparison between cw hole-burning
 and femtosecond spectro-temporal experiments are considered and perspectives for the coherent
 control of light fields or photochemical processes are also evoked.