Pulsed laser induced multiphoton photoconductivity in an indirect band gapcrystal: PbI2

Authors
Ahlawat, DS Gaur, A Singh, N Singh, RD
Citation
Ds. Ahlawat et al., Pulsed laser induced multiphoton photoconductivity in an indirect band gapcrystal: PbI2, PHYS ST S-B, 219(2), 2000, pp. 421-424
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA STATUS SOLIDI B-BASIC RESEARCH
ISSN journal
03701972 → ACNP
Volume
219
Issue
2
Year of publication
2000
Pages
421 - 424
Database
ISI
SICI code
0370-1972(200006)219:2<421:PLIMPI>2.0.ZU;2-8
Abstract
The photoconducting properties of PbI2, an indirect band gap crystal have b een studied using fundamental and frequency doubled Nd:YAG laser. The ratio of three and two photon absorption cross sections (gamma(3)/gamma(2)) have been calculated experimentally. The value of gamma(2) has been calculated by third order time dependent perturbation theory and that of gamma(3) has been estimated by making use of experimental results. Relatively lower valu es of the absorption cross-sections as compared to those of direct band gap crystals have been attributed to phonon-assisted transitions.