Raman frequency shift induced by photorefractive effect on Fe-doped lithium niobate

M Bazzan (1) , Ninel Kokanyan (2) , A Zaltron (1) , N Argiolas (2) , D. Chapron (2) , M. D. Fontana (2)

1 Dipartimento di Fisica e Astronomia "Galileo Galilei"
2 LMOPS - Laboratoire Matériaux Optiques, Photonique et Systèmes

We report on the observation of a time dependent frequency shift of the Raman modes in photorefractive Fe:LiNbO 3. The origin of this shift is attributed primarily to the space charge field which builds up due to photo-induced charge transport by the excitation beam, and to the subsequent piezo-induced strain. This phenomenon can be regarded as the Raman analogous of the photorefractive effect, in which the space charge field is detected by an electro-optic variation of the refractive index. It should be possible therefore to analyze it using standard models for photorefractivity. In this paper, we verify this claim discussing its validity. V C 2013 AIP Publishing LLC.

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Optique [physics.optics]

M Bazzan, Ninel Kokanyan, A Zaltron, N Argiolas, D. Chapron, et al.. Raman frequency shift induced by photorefractive effect on Fe-doped lithium niobate. Journal of Applied Physics, 2013, 114 (16), pp.163506. ⟨10.1063/1.4826628⟩. ⟨hal-01385633⟩