The structural and optical characteristics of polyvinyl alcohol (PVA) doped with di®erent concentration of Nd 2 O 3 nanoparticles to use an active media for polymer laser were studied. The PVA polymer was considered as the host and Nd 2 O 3 nanoparticles as the active element. The media as a thin¯lm was prepared using spin coating technique. Structural properties of layers were investigated by X-ray di®raction (XRD) pattern and atomic force microscope (AFM) technique. The e®ect of the concentrations of the neodymium source on the optical properties of Nd 2 O 3 /PVA thin¯lms was investigated through UV-Vis absorption spectroscopy and their optical band gap was evaluated. Also, the FTIR and°uorescence spectra of the samples were detected. The°uorescence spectra of¯lms showed that the maximum wavelength occurred at 568 nm with no signi¯cant shift.

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Reduction of image quality under the effects of wavefront aberration of the optical system has a direct impact on the vision system's performance. This paper tries to estimate the amount of aberration with the use of wavelet transform profilometry. The basic idea is based on the principle that under aberration effects, the position of the fringes' image on the image plane will change, and this change correlates with the amount of aberration. So the distribution of aberration function can directly be extracted through measuring the amount of changes in the fringes' image on the image plane. Experimental results and the empirical validity of this idea are evaluated.

The magneto-optic effects are known phenomena on magnetic media; these effects could be used in magneto-optics storages and switches. Recently; these effect are used in inducing the spintronic as well. In the present work we have considered the Kerr and Faraday effects on double evaporated Mn/Sb thin films. We evaporated a 100 nm Sb film on a cleaned glass substrate and then a 100 nm Mn film on top of the Sb layer. The prepared double film has been annealed in vacuum at about 150 °C for 5 hours. Then the magnet-optic hysteresis loop of film has been plotted. From the hysteresis loop the optical rotation was calculated. The measurement shows an optical rotation up to one degree which is quit reasonable for this media.