F.A. Korolev, A.I. Odintsov, and Khaled Susu

An experimental study has been carried out of the field distribution over the cross section of the 3.39 μ ASE beam from a helium-neon laser with a discharge tube 4 m long and 10 mm in diameter, operated far from saturation. It was found that the beam is channeled in the active medium of the laser and the result of this is that the beam diameter becomes much smaller than the tube diameter and, at the same time, the angular divergence of the beam approaches the diffraction limit.

N.V. Gordienko, A.V. Gusev, and V.N. Rudenko

Measurements of small forces by radiophysical methods based on the response of a mechanical oscillator are discussed. It is shown that a quasi-ideal transducer can be developed by using the dynamic damping of the transducer noise at a partial oscillator frequency. A calculation is given for an oscillator with a parametric capacitive transducer.

N.N. Dmitrieva

A description is given of a new pulsed resistance-period converter of high sensitivity. It is designed for operation with bridge-converted variable-resistance probes. The period is varied by varying a capacitor and the characteristic of the converter is linear. When the probe resistance changes by 0.2%, the period changes by a factor of three. The converter is based on integrated circuits.

Yu.G. Pavlenko and A.Kh. Mussa

An analysis is given of the influence of quantum-mechanical properties of radiation on the spin states of particles moving in an arbitrary undulator tube. The resulting expression for the spin-flip transition probability as a function of the particle energy and the anomalous magnetic moment is examined.

G.V. Belokopytov

The method of slowly-varying standing waves is used to obtain the truncated equations for the three-frequency resonance parametric interaction in nonlinear dielectric resonators. The equations are suitable for inhomogeneous and anisotropic media. Pump reaction and nonlinear detuning of both electrical and thermal character are taken into account.

M.A. Vorontsov and V.I. Shmal'gauzen

A general approach is developed to noise compensation in the Michelson Interferometer. Compensating systems containing sensitive elements with distributed parameters are examined. A highly stable practical system is proposed.

N.K. Shelkovnikov, N.N. Seleznev, S.I. Zaitsev, and A.A. Zamyatin

A.S. Logginov and V.E. Solov'ev

G.A. Lyakhov, Yu.P. Svirko, and N.V. Suyazov

S.I. Berezina, V.E. Lyamov, and I.Yu. Solodov