**Solid State
Science and Technology, Vol. 14, No 1(2006) 56-61**

ISSN 0128-7389

56

OPTICAL TRANSITION OF TRIVALENT NEODYMIUM (Nd3+) IN THE ANISOTROPIC CRYSTAL LITHIUM NIOBATE

M.R. Sahar, Ngurah Made D.P. and Md. Radzi Sudin

Optical Crystal Research Group,

Department of Physics, Faculty of Science,

Universiti Teknologi Malaysia,

81310 Skudai, Johor DT, Malaysia.

**ABSTRACT**

The absorption
spectroscopic analysis of the radiative transitions of Nd-doped LiNbO_{3}
has been analysed. The line strengths of several transitions from the ground
state to the excited state manifolds are evaluated from the measurement of the
polarized absorption spectra and are analyzed using the Judd-Ofelt (J-O)
theory. The transition-matrix elements for Nd^{3+} were calculated by
using intermediate coupling coefficient and the results were used to obtain the
J-O parameters. It is found that the intensity parameters (J-O parameters) of
this crystal Ω_{2}, Ω_{4} and Ω_{6}
are 2.1 x 10-20 cm-2, 5.6 x 10-20 cm-2, and 7.1 x 10-20 cm-2 respectively, with
the goodness, = 0.23 x 10-20. Meanwhile, the
spectroscopic quality factor, Q is found to be 0.79. The radiative lifetimes,
the branching ratios and the line transition strengths have been calculated and
were found to be dependent on the transition level. The radiative quantum
efficiency, ç is calculated by using multiphonon relaxation rates and it is
found that the lasing transition at 4F3/2, ç is around 0.83.

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