Due to various excellent properties such as nonlinear optical, electro-optical, piezoelectric, photorefractive ones Lithium Niobate (LN) is one of the most used ferroelectrics having a wide number of applications such as frequency doubling, phase-conjugation, holographic storage, SAW sensors. Furthermore, the possibility of doping with rare-earth ions leads to laser applications. Moreover, recently it has been shown that doping of LN with Ho3+ impurity ions leads to the essential reduction of optical damage at 532nm. Raman spectroscopy is a important spectroscopic technique providing a possibility to investigate physico-chemical, structural as well as optical properties of materials under study. Polarized Raman measurements were carried out on Ho-doped LN crystals with excitation wavelength of 532nm and 785nm. For measurements with green light in obtained Raman anti-Stokes spectra expected modes were detected which obey the Raman selection rules. In a contrast, Raman Stokes spectra are significantly different with comparison to what one expects according to selection rules. Well defined additional forbidden lines appeared having quite high intensity. It should be noted, that the intensity of mentioned lines increases with an increase of Ho concentration in the crystal. We attribute these to emission lines. So we can confirm that in the same Stokes spectrum we were able with a good resolution to detect, the transitions between the electronic states, and the vibrational states as well. Currently we present the analysis of these data as function of Ho content in the crystal, for the cases with different polarization and wavelengths of the incident laser beam.