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Pulsed Laser Induced Multiphoton Photoconductivity in an Indirect Band Gap Crystal: PbI 2
Author(s) -
Ahlawat D.S.,
Gaur Arun,
Singh Nageshwar,
Singh R.D.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200006)219:2<421::aid-pssb421>3.0.co;2-6
Subject(s) - photoconductivity , laser , materials science , band gap , absorption (acoustics) , crystal (programming language) , direct and indirect band gaps , photon , optics , atomic physics , optoelectronics , molecular physics , chemistry , physics , computer science , composite material , programming language
The photoconducting properties of PbI 2 , an indirect band gap crystal have been studied using fundamental and frequency doubled Nd:YAG laser. The ratio of three and two photon absorption cross sections ( γ 3 / γ 2 ) have been calculated experimentally. The value of γ 2 has been calculated by third order time dependent perturbation theory and that of γ 3 has been estimated by making use of experimental results. Relatively lower values of the absorption cross‐sections as compared to those of direct band gap crystals have been attributed to phonon‐assisted transitions.