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Буров, Л. И.; Varaksa, I. N.; Klishchenko, A. P.; Kozlov, I. N.

doi:10.1023/a:1026142329760

Cited by 2 publications

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“…In a series of papers [1][2][3][4][5], a new generalized approach was proposed and developed to describing the formation of polarized radiation in laser systems. It was based on the idea of laser emission as the superposition of polarization components whose polarization vectors span the entire set of possible polarized states.…”

Section: Introductionmentioning

confidence: 99%

“…It was based on the idea of laser emission as the superposition of polarization components whose polarization vectors span the entire set of possible polarized states. Based on the polarization component method, it was possible to explain a number of characteristic features on the energy and polarization characteristics of a liquid dye laser near the lasing threshold [1,2,5], and also to derive analytical relationships to describe their statistical properties [4]. In particular, distribution functions of the degree of polarization of the output radiation were found [4], and their variation as a function of the laser system parameters was studied.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the polarization component method, it was possible to explain a number of characteristic features on the energy and polarization characteristics of a liquid dye laser near the lasing threshold [1,2,5], and also to derive analytical relationships to describe their statistical properties [4]. In particular, distribution functions of the degree of polarization of the output radiation were found [4], and their variation as a function of the laser system parameters was studied. Based on the polarization component method, it was possible to quite correctly describe the appearance of the complex phase polarization structure of liquid dye laser radiation observed in the experiment [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, within the polarization component method, the process of formation of laser emission is described as successive enhancement of spontaneous emission, so taking into account the spectral composition of the latter seems quite reasonable. Furthermore, it has been shown [10-12] that, for example, in semiconductor injection lasers, we need to take into account enhanced luminescence in principle for correct determination of threshold and dynamic characteristics.A second limitation of the developed approach was neglect of laser intensity saturation effects, which considerably simplified the calculations and made it possible in principle to construct analytical expressions for the distribution function for the polarization of the output radiation [4]. However, such an assumption limits the range of application of the polarization component method to the near-threshold region (as formulated in the original problem [1, 2]), while establishment of the output intensity in a high-Q cavity directly depends on the lasing saturation effects.…”

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Polarization component method for calculation of the multiple-frequency lasing regime

2007

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We have shown that the polarization component method can be extended to the case of broadband emission (multiple-frequency approximation) if we make the approximation of slowly varying amplitudes and statistical independence of the polarization components. From the results of numerical modeling for the case of a liquid dye laser, it follows that the multiple-frequency approximation is meaningful to use for analysis of the spectral, polarization, and energy parameters in the region near and below the lasing threshold, and also for the statistical characteristics but taking into account saturation effects for the laser emission.Introduction. In a series of papers [1-5], a new generalized approach was proposed and developed to describing the formation of polarized radiation in laser systems. It was based on the idea of laser emission as the superposition of polarization components whose polarization vectors span the entire set of possible polarized states. Based on the polarization component method, it was possible to explain a number of characteristic features on the energy and polarization characteristics of a liquid dye laser near the lasing threshold [1,2,5], and also to derive analytical relationships to describe their statistical properties [4]. In particular, distribution functions of the degree of polarization of the output radiation were found [4], and their variation as a function of the laser system parameters was studied. Based on the polarization component method, it was possible to quite correctly describe the appearance of the complex phase polarization structure of liquid dye laser radiation observed in the experiment [6,7]. We should note that, although initially the polarization component method was developed with an aim toward liquid dye lasers, it has been demonstrated that it can be used to analyze dynamic states in the polarization instability region in VCSEL systems [8].However, the developed polarization component method involves two aspects which considerably limit its applicability as a general approach to describing formation of polarized radiation in laser systems. The first aspect is connected with the single-frequency approximation, the basis for all subsequent conclusions. Generally speaking, such an approximation is widely used in laser theory, including to describe polarization effects [9]. At the same time, within the polarization component method, the process of formation of laser emission is described as successive enhancement of spontaneous emission, so taking into account the spectral composition of the latter seems quite reasonable. Furthermore, it has been shown [10-12] that, for example, in semiconductor injection lasers, we need to take into account enhanced luminescence in principle for correct determination of threshold and dynamic characteristics.A second limitation of the developed approach was neglect of laser intensity saturation effects, which considerably simplified the calculations and made it possible in principle to construct analytical expressions for the distrib...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Polarization component method for calculation of the multiple-frequency lasing regime

2007

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“…Based on the solution of Eq. (3), the output radiation parameters [2][3][4], including also the Stokesian ones, can be calculated. A different situation arises in the presence of correlations between polarization components.…”

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Phase Correlations and Polarization Characteristics of Dye-Solution Laser Radiation

Буров

Varaksa

2005

J Appl Spectrosc

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The influence of phase correlations of components on the energy and polarization parameters of output radiation have been calculated within the framework of the formalism of polarization components. It is shown that these correlations have a marked effect only on the energy characteristics. At the same time, an analysis of the polarization characteristics of a probe wave provides rich information for the analysis of the phase-polarization structure of radiation. An analysis of experimental data allows the inference that the correlation of components is relatively weak even for lasers with a high-Q resonator and at a high excess of threshold values. Introduction.In a series of works [1-4], a new generalized approach to the description of formation of polarized radiation in a dye-solution laser was suggested and developed. It is based on the representation of laser radiation in the form of a superposition of polarized components, the polarization vectors of which encompass the entire set of possible polarization states. Based on the method of polarization components, a number of characteristic features in the dependences of the energy, polarization, and statistical characteristics of a dye-solution laser near the lasing threshold have been explained.The calculations [2-4] were based on the assumption of statistical independence of the polarization components, which is quite explicable from the viewpoint of the physical mechanism underlying the start-up of the process of lasing as a successive strengthening of spontaneous emission. It was assumed that the statistical independence of polarization components may be considered as the first approximation, and in the process of lasing build-up the phase correlation of polarization components may arise (spontaneously or as a result of any induced processes) and successively become stronger because of the presence of strong feedbacks. Strictly speaking, the method of polarization modes [5, 6], which rather adequately describes the characteristic features of the emission of polarized dye-solution laser radiation upon substantial excess over the threshold, is based on the assumption that the state of radiation polarization can generally be elliptic, i.e., the phase of a light wave is quite a definite one. In other words, the polarization modes are "pure" orthogonal states, the superposition of which completely describes polarized laser radiation.From the viewpoint of the adequacy of this approach, of certain interest are the results of [7,8], in which a change in the polarization of a scanning wave passing through the couvette of a dye-solution laser pumped by a highpower linearly polarized radiation was investigated. Actually, these experiments to a certain extent repeat the classical scheme of nonlinear polarization spectroscopy [9], and, to interpret the results, the basic elements of the corresponding theory of [10] were used: on excitation by a linearly polarized radiation, an orientational anisotropy is created in a molecular medium, and a scanning linearly polarized w...

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Cited by 2 publications

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Polarization component method for calculation of the multiple-frequency lasing regime

Polarization component method for calculation of the multiple-frequency lasing regime

Phase Correlations and Polarization Characteristics of Dye-Solution Laser Radiation

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