Host-dependent optical dephasing of dye molecules doped in cross-linked polyvinyl alcohols
✍ Scribed by M. Kawase; S. Fujiwara; S. Nakanishi; H. Itoh
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 604 KB
- Volume
- 194
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Host-dependent optical dephasing of the zero-phonon line of two organic dye molecules doped in several cross-linked polyvinyl alcohol (PVA) derivatives was studied by using an incoherent photon echo technique. It was found that the optical dephasing time of the zero-phonon line increases with increasing the length of the cross-link introduced to the PVA backbone. Our results indicate that, by the introduction of the cross-link, the effect of the two-level tunneling system in PVA on optical dephasing of a doped dye is greatly reduced and the dephasing time of the dye becomes longer than that in the PVA without the cross-link. The decrease of the optical dephasing can be interpreted by assuming a void space in PVA, which is created near to an introduced cross-linker.