PICOSECOND INDUCED ABSORPTION IN ULTRADIS PERSE AMORPHOUS SELENIUM PARTICLES

Authors
YUMASHEV KV MIKHAILOV VP GURIN VS PROKOSHIN PV ARTEMEV MV ZHMAKO SP
Citation
Kv. Yumashev et al., PICOSECOND INDUCED ABSORPTION IN ULTRADIS PERSE AMORPHOUS SELENIUM PARTICLES, Kvantovaa elektronika, 21(9), 1994, pp. 887-890
Citations number
22
Categorie Soggetti
Physics, Applied","Engineering, Eletrical & Electronic
Journal title
Kvantovaa elektronika → ACNP
ISSN journal
03687147
Volume
21
Issue
9
Year of publication
1994
Pages
887 - 890
Database
ISI
SICI code
0368-7147(1994)21:9<887:PIAIUP>2.0.ZU;2-3
Abstract
A study was made of the induced absorption in amorphous selenium parti cles (average radius approximately 20 nm) embedded in a polymer. A pic osecond pump and probe technique was used. The change in the absorptio n was measured in the spectral range 550-750 nm when the pump radiatio n was in the form of pulses of 15 ps duration and 2.3 eV photon energy . The induced-absorption spectra were attributed to optical exciton-bi exciton transitions. The exciton lifetime was estimated to be 424 +/- 32 ps.