Mikhail M. Malikov

Design and physical features of inductive coaxial copper vapor lasers

A physical model of a copper vapor laser pumped by a pulse-periodic inductive (electrodeless) discharge is considered. The feasibility of efficient laser pumping by an inductive discharge and reaching high output parameters comparable to those of conventional copper vapor lasers pumped by a longitudinal electrode discharge is demonstrated. The design and physical features of an inductive copper vapor laser with an annular working volume are discussed.

On the possibility of efficient pumping of copper vapor lasers by a pulse-periodic inductive discharge

Copper vapor laser (CVL) excitation by a pulse-periodic inductive (electrodeless) discharge was numerically studied. The first results of calculations are presented, physical conditions and design parameters at which CVL pumping by an inductive discharge can be implemented are analyzed.

Copper vapor laser pumped by pulse-periodic high-frequency discharge

We present the results of numerical experiments considering the physical processes specific to the laser based on self-terminating atomic transitions of copper and study of the output characteristics of this laser numerically. The laser is pumped by trains of high-frequency (10−70 MHz) current oscillations with the repetition rate of 2−30 kHz. Inductive-type electrodeless discharge pumping is regarded. The calculations were carried out for a small set of the specified basic parameters providing a way to partially optimize the performance of the laser over its basic output characteristics and to reveal its features. The feasibility of efficient laser pumping by high-frequency discharge is demonstrated. In our numerical experiments the maximum value of the physical efficiency was about 6% and the maximum average laser output power was as high as 174 W. These values were obtained for a discharge chamber with a volume of 1.7 L.

Characteristics of inductive coaxial copper vapour lasers

We present new results on numerical investigation of characteristics of pulse-periodic inductive copper vapour lasers. In these lasers pump pulses are trains of high-frequency (~ 30 MHz) current oscillations repeated at a frequency of 2-17 kHz. An inductive laser with an annular working volume of 1.7 l was considered and its possible output parameters were studied. We analyze specific features of working medium excitation in an HF-discharge; diversity of the obtained laser pulse shapes and possible applications are discussed as well.

Features of Copper Vapor Laser Emission Excited by Pulse-Periodic HF Discharge

The results of numerical studies of pulsed radiation of the induction copper vapor laser are presented. The laser is excited by trains of high-frequency (10–70 MHz) electric current oscillations. Trains follow one after another with a frequency in 2–17 kHz. The features and variety of obtained laser radiation pulse shapes and their applicability to diagnostic purposes and other practical problems are discussed.

Morphology of Tungsten Nanooxides, Synthesized by Laser Ablation of Metal in Water

Colloidal solution precipitates obtained during laser ablation of tungsten in water and containing nanostructured metal oxides are studied using X-ray diffraction and scanning electron microscopy. The nanostructure composition and morphology are analyzed. It is shown that the material composing nanostructures is X-ray amorphous, i.e., the particle size does not exceed 1–2 nm. The high degree of the structure surface development implies prospects of their use as substrata when analyzing the composition of various materials by surface-enhanced Raman scattering.

Composition, morphology characteristics, and optical properties of molybdenum oxide nanostructures synthesized by the laser ablation method in liquid

We present experimental data on composition, morphology, and certain optical properties of nanostructures of molybdenum oxides (MoOx). We show that, upon ablation in water, molybdenum oxides are predominantly synthesized as amorphous masses containing particles (clusters), below 1–2 nm in size, and foam-like structures. We note that the gas bubbles (occurring in the liquid during ablation) might serve as templates for hollow quasi-spherical formations observed in the experiment.

Some physical properties of zirconium and molybdenum oxide nanostructures produced by metal laser ablation in water

A number of results of experimental studies of physical properties of nanostructures of oxides of transition metals, i.e., zirconium (Zr) and molybdenum (Mo), obtained by laser ablation of metal targets in water are presented. The structure, morphology, and some optical characteristics are studied. It is shown that Zr and Mo oxides are synthesized under these conditions mostly as amorphous masses containing particles less than 1–2 nm in size, of which large nanostructures and hollow quasi-spheres are formed.