A three-dimensional (3-D) imaging configuration with a holographic scanner and two auxiliary reflectors is discussed, which employs a Nd:YAG laser that operates at a wavelength of 1.06 μm. Compared with traditional scanners, holographic scanner has many advantages, such as smaller in size, lighter in weight and simpler in structure. The data collected are stored into a 3-D array of 8-bit intensity values and displayed in two ways, a 2-D intensity image or a 3-D image. The 3-D image is displayed on the screen of a computer according to the perspective transformation technology of coordinates.
The spectral properties of Er3+-doped tellurite glasses whose compositions are 40TeO2-40WO3-10ZnO-10Na2O and 40TeO2-40WO3-10 PbCl2-10Na2O were measured and analyzed by using Judd-Ofelt and McCumber theories. Compared with traditional tellurite glasses, these glasses have more stable thermal properties and the emission spectra and emission cross sections at the 1.53 m band are larger and broader. Based on the measured absorption spectra, the spontaneous transition probabilities, the fluorescence branching ratios and the radiative lifetimes of these glasses were also calculated.