Time evolution of Symmetry-forbidden Raman lines activated by photorefractivity Article Swipe
Related Concepts
Raman spectroscopy
Raman scattering
Photorefractive effect
Anisotropy
Symmetry (geometry)
Lithium niobate
Excitation
Beam (structure)
Molecular physics
Optics
Physics
Atomic physics
Materials science
Quantum mechanics
Mathematics
Geometry
Ninel Kokanyan
,
M. Bazzan
,
Laura Vittadello
,
D. Chapron
,
Edvard Kokanyan
,
M.D. Fontana
·
YOU?
·
· 2019
· Open Access
·
· DOI: https://doi.org/10.1038/s41598-019-49801-x
· OA: W2973913598
YOU?
·
· 2019
· Open Access
·
· DOI: https://doi.org/10.1038/s41598-019-49801-x
· OA: W2973913598
Transmission Raman spectroscopy experiments were performed on iron doped congruent lithium niobate within two –in principle equivalent- configurations, namely Y ( ZX ) Y and Y ( XZ ) Y . While the former respects the Raman selection rules, the other configuration gives a time dependent spectrum that, after a transient time of several minutes, finally results in a mixture of expected and forbidden modes. This breaking of Raman selection rules is caused by the spontaneous conversion of a part of the ordinarily polarized pump beam into an extraordinarily polarized beam by photorefractive anisotropic self-scattering. A numerical modelling of the phenomenon is developed and fairly reproduces the time dependence of conversion energy.
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