Lasing threshold of a nuclear-pumped gas laser versus the residence time of the lasing medium inside a laser unit

It is shown experimentally that, when the residence time of the lasing mixture in a laser unit increases from 60 to 120 min, the lasing threshold grows and the energy parameters of the laser degrade. The latter effect is associated with impurity gas accumulation. Impurities are found to variously influence the operating characteristics of the lasing media considered in this paper.     

Selectivity of the optical-absorption method based on an instrumental pick out of Fourier components in the absorption spectrum

The introduction of interference–polarization filters (IPFs) in the structure of an optical–absorption analyzer makes it possible to pick out a harmonic (a Fourier component of the absorption spectrum) providing measurement with the highest sensitivity. The selectivity of such a method of analysis is determined by overlapping the oscillations of the measured and interfering components. By the example of measurement in benzene in the presence of an interfering component (toluene), the possibility is considered for the optimization of selectivity due to the variation of the path-difference dispersion for ordinary and extraordinary interfering rays. The metrological characteristics of the interference–polarization analyzer of C₆H₆ confirming the results of calculations are given.     

Analysis of lasing threshold of a nuclear-pumped gas laser depending on the lasing medium residence time in the laser module case

It is shown experimentally that an increase in the lasing mixture residence time in the case of a laser module over 60–120 min prior to an experiment elevates the lasing threshold and deteriorates the energy parameter of the laser. The worsening of the energy parameters of the laser may be due to accumulation of impurity gases. It is shown that the presence of impurities affects the working characteristics of the laser media under investigation to various extents.     

Application of interference-polarization filters for the optical absorption method of gas analysis

A number of B.N. Grechushnikov’s works were devoted to the application of interference-polarization filters as a two-beam interferometer for Fourier-spectroscopy. In this paper the potential of these filters for the optical absorption method of gas analysis (specifically, the selective measurement of components with overlapping absorption spectra) is considered.     

Adaptive X-Ray Optical Elements Based on Bending Piezoactuators: Possibilities and Prospects of Practical Application

Crystallography Reports - The possibilities of a new class of adaptive X-ray optical elements based on bending piezoelectric actuators for practical implementation of time-resolved experiments...     

Effect of birefringence dispersion on the selectivity of benzene absorption measurements using interference-polarization filters

A technique for calculating absorption interference patterns of aromatic hydrocarbons with allowance for the birefringence dispersion of an interference-polarization filter is proposed. An experimental model of an optical absorption gas analyzer based on a Wood filter with magnesium-fluoride plates for measuring benzene and toluene characteristics is described. The measurement data are compared with the calculation results. The possibility of applying a combined plate to improve the selectivity of absorption measurements for benzene with respect to toluene is considered.     

Sensitivity of the optical absorption method based on instrumental selection of Fourier components of the absorption spectrum

A new analytical method of optical absorption analysis, based on selection of a Fourier component of the absorption spectrum (characteristic of the material under study) by a polarization interference filter, has been proposed and tested experimentally.