Garif G. Akchurin

Improving Image Quality in Reflection Confocal Microscopy Involving Gold Nanoparticles and Osmotically Active Immersion Liquids

We consider the possibility of using gold nanoparticles to improve the image contrast of biotissue structures in reflection confocal laser microscopy. We present the results of experimental studies using gold nanospheres with a diameter of 60 nm compared to osmotically active immersion contrast agents based on glycerol.

Speckle polarization diagnostics of scattering media using partially coherent radiation

The paper discusses a method for probing a randomly inhomogeneous medium using partially coherent radiation and polarization filtering of the radiation scattered by the medium. The method is based on the analysis of the contrast of speckle-modulated images of the object under study as a function of the coherence length of the probe radiation. A theoretical justification of the method is given as applied to systems of discrete scatterers with the subsequent modification of the results obtained for continuously distributed scattering systems. The results of experimental testing of the developed method for scattering media characterized by nondiffusion conditions of propagation of the probe radiation are presented and compared with the results of the theoretical analysis.

Modulation method for determination of the degree of excitation of a gas laser

A modulation method for the determination of the relative excitation of a single-mode gas laser was developed and tested experimentally. The method has the advantage that no independent measurements of the temperature of the active substance are required.

Corrections to "Modulation of He-Ne laser radiation by discharge current perturbations" [Sov. J. Quantum Electron. 5, 678 (1975)]

Modified estimates are given of the modulation characteristics and inertia of the establishment of the electron density in an He-Ne laser. Comments are also made by the authors on their paper.