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Proceedings Paper

Optical phonon effects on linewidth of several laser active ions in YAG
Author(s): Aurelia Lupei; Voicu Lupei; T. G. Sorop; Eugen Osiac; A. Petraru
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Paper Abstract

An analysis of low temperature lineshapes for various absorption lines of several RE3+ ions from the beginning Nd3+ and end of lanthanide series Er3+, Tm3+ embedded in the same crystal - YAG known as important laser systems for 1-3 micrometers emission is presented. New aspects of the dependence of electron-phonon coupling on RE3+ ions and matrix are observed from the analysis of many transitions of these ions at low temperature. These data show that eh electron-phonon coupling presents a symmetric behavior in the lanthanide series, larger toward beginning and end. With only very few exceptions, less than 2 percent, the broadenings or splittings of zero-phonon liens could be connected to optical Raman phonons of undoped lattice. That means that the parity of 4fn states could still be considered a good parent quantum number, even if the local symmetry has no inversion, and the near resonant coupling involves the even part of the electron-phonon coupling operator. Besides, the one phono relaxation involve the undoped lattice phonons. For ions with small spin-orbit coupling, the vibronic contribution to the line intensity given by ir phonons through a Van Vleck mechanism could be important for spin forbidden transitions.

Paper Details

Date Published: 23 February 2000
PDF: 8 pages
Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); doi: 10.1117/12.378675
Show Author Affiliations
Aurelia Lupei, National Institute for Laser, Plasma and Radiation Physics (Romania)
Voicu Lupei, National Institute for Laser, Plasma and Radiation Physics (Romania)
T. G. Sorop, National Institute for Laser, Plasma and Radiation Physics (Romania)
Eugen Osiac, National Institute for Laser, Plasma and Radiation Physics (Romania)
A. Petraru, National Institute for Laser, Plasma and Radiation Physics (Romania)


Published in SPIE Proceedings Vol. 4068:
SIOEL '99: Sixth Symposium on Optoelectronics
Teodor Necsoiu; Maria Robu; Dan C. Dumitras, Editor(s)

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