Simulation of pumping beams self focusing and defocusing in NH3 Raman laser

High power IR pumping beams self focusing and defocusing in NH₃ Raman laser is investigated by numerical methods on the basis of the solution of nonlinear quasioptical equations. The analysis of self focusing have been done for a wide range of parameters of radiation and of active medium. Spatial evolution of the beam configuration have been investigated for different regimes of nonlinear diffraction. Developed model enables to allow exactly for the spectroscopic features of active molecules and may be applied to the analysis of the properties of powerful optically pumped FIR lasers.     

Studying the interaction of alpha-gal carbohydrate antigen and proteins by quartz-crystal microbalance

The interaction of alpha-galacosyl antigen and its binding protein (anti-Gal antibody) has been studied by quartz crystal microbalance through a SAM immobilization technique which overcomes the nonspecific interactions and molecule trapping for current piezoelectric biosensors.     

Degenerate four-photon parametric interactions (DFPI) in optically pumped CH3F laser

Conclusion The results of the investigation make it possible to draw a conclusion that the DFPI processes do not influence significantly the spectral composition and the energy values of the output FIR emission in a superradiant CH₃F laser. They are determined in fact by the Raman processes. But anyway the DFPI processes are of great importance for the MIR emission generation and lead to the appearance of a large number of intensive MIR lines in the IR wavelength range.     

13CH3F and12CH3 mixture FIR Raman lasar

Experimental results of the investigation of¹³CH₃F and¹²CH₃F isotopic mixture as an active medium of optically pumped FIR laser are presented. The experimental data of the output FIR and MIR radiation are given.     

The Theory of Block Structures in Problems on the Strength of Galleries and Constructions with Multiple Connections

Doklady Physics - It is shown that the boundary-value problem for a layered medium with parallel multiple cavities is reduced to the Riemann vector problem. To solve it, a factorization method is...     

Emission spectra of the tunable Raman CH3F optically pumped fir laser

The six-level model using a density matrix approach to simulate properties of a gas resorant media in optically pumped FIR lasers was developed. The model accounts for multiphoton as well as parametric processes. Advantages of the developed model are demonstrated by calculation and discussion of the gain and saturated emission spectra of CH₃F laser when transitions with different J rotational numbers of CH₃F are pumped.     

Interaction of polarized fields with A resonant medium of NH3 laser

A numerical model of optically pumped FIR laser for arbitrary field polarizations is discussed. A restricted set of linear equations is proposed. Calculated spectra for NH₃ laser pumped by CO₂ laser are presented. The validity and limitations of the model are considered.