The optimization of near infrared CW Gd3Ga5O12:Nd-,YAIO3:Nd- AND YVO4:Nd- microlasers
The modeling of CW GGG:Nd- (1.4237 mum), YAP:Nd- (1.34 mum), YVO4:Nd-microlasers (1.0643 mum) is carried out. At that for the each fixed value of the incident pumping power and the laser beam divergence the optimal values of the activator concentration, the active medium length and the reflectivity of the output mirror, i.e. the values that maximize the laser power, are determined.
Heating processes in cw four-level microlasers and their influence on the parameters of the laser mode
The heat processes are considered for continuous wave GGG:Nd, YAP:Nd, YVO4:Nd and YAG:Nd microlasers. The distribution of the temperature as well as the thermo-induced changes of the refraction index and the deformations is determined. At the given distributions of the refractive index and the deformations the components of (ABCD) - matrix, the laser beam waist and the divergence are determined in the wide range of the values of the pumping beam power and radius, the heat transfer coefficient and the geometrical sizes of the active element.
Integrating Al with NiO nano honeycomb to realize an energetic material on silicon substrate
Nano energetic materials offer improved performance in energy release, ignition, and mechanical properties compared to their bulk or micro counterparts. In this study, the authors propose an approach to synthesize an Al/NiO based nano energetic material which is fully compatible with a microsystem. A two-dimensional NiO nano honeycomb is first realized by thermal oxidation of a Ni thin film deposited onto a silicon substrate by thermal evaporation. Then the NiO nano honeycomb is integrated with an Al that is deposited by thermal evaporation to realize an Al/NiO based nano energetic material. This approach has several advantages over previous investigations, such as lower ignition temperature, enhanced interfacial contact area, reduced impurities and Al oxidation, tailored dimensions, and easier integration into a microsystem to realize functional devices. The synthesized Al/NiO based nano energetic material is characterized by scanning electron microscopy, X-ray diffraction, differential thermal analysis, and differential scanning calorimetry.