A theoretical calculation is given of the width a nonlinear power resonance at its midamplitude and same deduced from maximum derivative. Allowance made for finite size light beam field distribution in assumed to be Gaussian.

An analysis is made of the operation a solid-state ring laser in presence weak external signal. A transient solution obtained instability range absence such Then, consideration given to influence unidirectional signal, an signal combination with nonresonant backward stimulated scattering, and two independent contrarotating signals. Widths frequency-locking regions criterion amplitude stabilization are found conditions for existence traveling-wave regime maximum transfer energy scattered...

Control of the object with one output using many inputs is widely used for combining advantages every input and eliminating disadvantages two or more control channels. Such systems are called MISO, which means Many Inputs - Single Output. For calculation such we have proposed a theory based on logarithmic frequency response. This method has proved to be excellent in laser physics other where single channel insufficient. As rule channels higher speed but small range changing value. The allows...

Laser measurement systems for displacement-deformation have been used usually in geodesy.Investigations of present-day crust deformation are very important using spatial and time framework.Experimental laser results collected at Talaya seismology station (Baikal region) presented this article.Original permanent measurements the underground gallery.Variation tidal parameters received between 1995 2015 was analyzed regional data local earthquake (M > 5.5).Anomaly behavior has strong...

The results are given of theoretical and experimental investigations stimulated emission from a modelocked negative-feedback solid-state (ruby) laser. Under certain conditions, governed by the delay time in feedback circuit, laser suffers high-frequency instabilities form sehvlocked intermode beats. These increase significantly stringency requirements which have to be satisfied if negative is used for amplitude stabilization.

The task of control object, prone to oscillation is still relevant. It has not been solved successfully yet. In particular, it important the object having in polynomial numerator its transfer function negative coefficient term first order [1]. This or close with varying degrees success a number papers [1-14]. For example, proposed use bypass channel, which development idea Smith predictor [1, 2]. channel eliminated reverse overshoot, but transient process preserved significant deviation and...

The paper considers the main aspects of ensuring phase-locked looping two lasers to each other. This problem is extremely important for laser physics. In traditional systems, this binding was carried out by using circuits, namely frequency tuning and phase tuning. loop provides capture conditions, but in mode, it interferes with operation reduces accuracy entire system. addition, solution unnecessarily cumbersome, which increases cost system complicates its implementation, configuration use....

Precise gravity measurements at g0·10 -9 level requires taking into account density change, caused by the Earth’s crust deformation and movement position of fluid in layer. The paper presents analysis water observation three boreholes situated Primorie, Kamchatka Baikal region. Water-level fluctuations were influenced earth tides, barometric pressure, co-seismic effects season precipitations. Water tidal signal was analyzed for calculations level-strain coefficients, its values changed from...

The paper describes the method of empirical mode decomposition and its application in analysis data obtained by laser measurement deformation. issues adaptation to actual are discussed. described allows tracing monotonous trend slow term deformation much more efficient as against conventional techniques. Furthermore, is also good removal noise high-frequency components from signals.

A study is made of the profile and characteristic features first three harmonics power absorbed as a result resonant interaction standing frequency-modulated wave with gas twolevel molecules. No restrictions are imposed on amplitude frequency deviation or modulation frequency. It shown that when become comparable line width resonance transition, differ considerably from derivatives nonlinear at carrier

A solution is obtained to the problem of a resonant interaction gas atoms with field three strong standing-wave pulses separated in time. calculation reported correction power absorbed by gas, which oscillates near center an atomic line as function frequency characteristic scale order reciprocal time delay between pulses. It shown that signal then appears for all rational values ratio delays and it related transfer—along axis—of higher spatial harmonics polarization medium level populations.

The field dependence of the susceptibility a gas interacting with standing wave is calculated near center line for arbitrary profile. An allowance made effects spatial modulation gas. Numerical calculations are reported Gaussian profile allowing degeneracy. These can be checked directly against experimental results transition corresponding to at λ = 3.39 μ in CH4 , which should make it possible determine accurately dipole moment transition. amplitude and half-width Lamb dip on basis...

Precise control of dynamic objects with negative feedback loop is widely used in science and industry [1-3]. Control accuracy depends on properties the regulator, as well sensor output value. Often choice best impossible, because different sensors may have different, none them over whole frequency range. In this paper, research work carried out base mathematical simulation some theory. The modeling proof method effectiveness specific examples. together object give task single input two...