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Two-photon absorption coefficient in p-terphenyl crystal determined through three-photon carrier generation

✍ Scribed by Eizi Morikawa; Masahiro Kotani

Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 489 KB
Volume: 105
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(84)80047-0

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✦ Synopsis

Charge carrier generation jn~-~e~henyl crystal is studied empfo+g puIsed excitation with ;I dye laser_ The number of phorogenerated carriers is found to be proportional to 13, x\hercI is rhe intensit)-of the exciting Ii&r nt 590 nm. The fluerescence intensity 1s proportional to I2 under the same conditions_ The results are Interpreted in terms of the phoroionization of two-photon ewltcd singlet excitons. A coefficwxt of (2.1 k O-8) X 10-50 cm4 Jphoton for the wo-photon absorptlon at 590 nm inp-terphenyl crystal is obtained_

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It has been found that higher excited states, populated by two-photon absorption, ionize with an effkiency which, in the energy range of 5.3-6.4 eV, is independent of the energy of the excitation. This behavior is similar to that observed in sequential twostep excitation (exciton photoionization) an