Premium
Emission and Absorption Cross Sections at 810 and 860 nm Bands of Er 3+ in LiNbO 3 Crystal
Author(s) -
Zhang DeLong,
Chen Bei,
Hua PingRang,
Pun Edwin Y.B.
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12009
Subject(s) - excitation , atomic physics , emission spectrum , polarization (electrochemistry) , perpendicular , crystal (programming language) , spectral line , absorption cross section , single crystal , chemistry , molecular physics , physics , cross section (physics) , crystallography , geometry , mathematics , quantum mechanics , astronomy , computer science , programming language
We have measured the unpolarized and polarized emission spectra of 4 I 9/2 → 4 I 15/2 (810 nm) and 4 S 3/2 → 4 I 13/2 (860 nm) electronic transitions of Er 3+ in LiNbO 3 crystal under different incident directions and polarization states of excitation beam. From the measured emission spectra, the emission and absorption cross‐section spectra were calculated based upon McCumber theory. It is found that Er 3+ electronic transition shows interesting excitation beam direction effect in polarization dependence, spectral shape, and cross‐section value. Both transitions are highly π‐polarized as the excitation beam was aligned perpendicular to the optical axis of crystal while being highly σ‐polarized as the excitation beam was oriented parallel to the optical axis of crystal. The spectral shape in the case of the perpendicular excitation is very different from that in the case of parallel excitation. The cross‐section value in the perpendicular excitation case is at least 1.5 times larger than that in the parallel excitation case. These excitation direction effects are independent of the polarization state of excitation light, and are attributed to the selective Er 3+ site excitation. In addition, the Er 3+ 860 nm emission lifetime was measured to be 27 ± 5 μs and the quantum efficiency of the emission is 2.5%.