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30 May 2003 Laser beam characterization in uniaxial crystals
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We give a full characterization of laser modes propagating along the optical axis of an unbounded uniaxially anisotropic crystal, evaluating the analytical expressions of the beam parameters and putting the combined effects of diffraction and anisotropy into evidence. We consider a HG mode of any order Ex, linearly polarized along the x-axis at the entrance facet of the crystal, and we derive the spot-size evolution formula and the corresponding angular divergences: due to anisotropy, the beam parameters evaluated along the x- and y-axes have different expressions. The optical beam suffers a change of the polarization state, and a y-component of the electric field Ey arises from anisotropy: we evaluate the spot-sizes along the x- and y-axes, and the associated angular divergences. The mutual coupling between the Cartesian components of the field results in a reduction of the energy associated to Ex and a corresponding increase of the optical power associated to Ey: we calculate the analytical expression of the energy exchange between the Cartesian components of the optical beam and their asymptotic values. The analytical results are confirmed by a set of experimental measurements with a calcite crystal.
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Gabriella Cincotti, Alessandro Ciattoni, Damiano Provenziani, Claudio Palma, and Horst Weber "Laser beam characterization in uniaxial crystals", Proc. SPIE 4932, Laser-Induced Damage in Optical Materials: 2002 and 7th International Workshop on Laser Beam and Optics Characterization, (30 May 2003);

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