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Laser surface melting of cobalt monocrystal
(Wydawnictwo Politechniki Łódzkiej, 2007) Rożniakowski, Kazimierz
The paper presents a concise description of laser surface melting of cobalt monocrystal and some related phenomena. Pulses of electromagnetic radiation of nano and mili-second duration, generated by Nd:YAG laser were used for surface heating. Light was incident on (0001) plane of cobalt monocrystal. The influence of surface roughness on the domain image observed with SEM ( type I magnetic contrast) was examined. Roughness of the surface was changed by polishing with diamond powders and superficial melting with nanosecond pulse of laser energy. The r.m.s. profile deviation σ of the examined surfaces was determined with reflexometric method. The depth of layer melted with nanosecond light pulse was evaluated for the isotropic model of metal and on the assumption that material constants are not temperature-dependent. Qualitative discussion of the phenomena associated with laser surface melting, i.e. generation of capillary waves and refinement of the Kittel type magnetic domains was included.
Lasery a kryształy
(Wydawnictwo Uniwersytetu Łódzkiego ; Łódź, 2005) Rożniakowski, Kazimierz
In the paper physical fundamentals of the functioning of ruby and neodymium lasers with crystals used as their elements are described. Some possibilities of crystals applications in quantum electronics are also presented. Several photos (made by SEM) of craters, generated by laser pulse energy on the (0001) cobalt monocrystal surface, illustrate results of lasers applications in science.
Propagation of laser beam in air stream colliding with non streamlined obstacle
(Wydawnictwo Politechniki Łódzkiej, 2011) Klemm, Katarzyna; Pieszyński, Krzysztof; Rożniakowski, Kazimierz
The paper presents measurements of refractive index structure constant Cn in the region of air inflow in vicinity of non streamlined obstacle (a model of a building) placed on a flat surface. Examinations were conducted in aerodynamic tunnel which transverse dimensions were much bigger than the examined model. The applied narrow beam of laser light had elliptical cross-section. Computations of Cn parameter were based on the dancing spot model [1].