Doped and undoped nanostructured titanium dioxides were prepared via Sol-Gel method under varying conditions to investigate the effects of neodymium ion doping on the titania optical properties in MID IR range. X-ray diffraction analyses show that the amorphous structure of the prepared samples turns to anatas polycrystalline structure after annealing process at 500˚C. FTIR spectrums for pure and doped samples after annealing show a single transmission peak at wave number around 1200 cm . The transmission rate of the peak depends on Nd 3+ concentrations and its value rises from 1.82% (for pure TiO 2 ) to 86.9% (for doped with 12%wt Nd 3+ ). Shifting on the peak occurs with a maximal shift at 7%wt Nd 3+ and then becomes stable at higher concentration. FTIR spectra give a good indication in the direction of preparation of optical band-pass filter at a wavelength around 8.34 µm (~1200 cm ).

Ytterbium doped TiO 2 nano-particles were prepared via Sol-Gel Technique under varying conditions to investigate the effects of Ytterbium ion doping on the Titania optical properties in MID IR range. X-ray diffraction analyses show that prepared Yb 3+ doped TiO 2 samples have polycrystalline structure in Anatas phase. FTIR spectrums for pure and doped samples after annealing process show a single transmission peak at wave number around 1145 cm −1 . Transmission rate of this peak depends on Yb 3+ concentrations and its value rises from 1.82% (for pure TiO 2 ) to 58.1% (for doped with 1.13 wt% Yb 3+ ). Slightly peak shift occurs at a lower doping rate with no further response to higher concentration rate. FTIR spectra gives a good indication in direction of preparation of optical band-pass filter at a wavelength around 8.733 µm (~1145 cm ).

Titanium dioxide nanoparticle doped with Europium ions Eu3+ was synthesis by performing of sol gel technique, the UV-Visible spectroscopy and fluorescence spectroscopy were used to investigate the spectroscopic properties of prepared doped sample. Two peaks at wavelength around 590nm and 612nm are recorded in fluorescence spectrum (wavelength of excitation light source equal to 390nm). The UV-Visible and fluorescence spectra are analyzed to determined peak emission cross-section σem. Depending on the suitable value of σem, it could strongly suggest to use Eu:TiO2 as optical material for laser action.