Ultrahigh energy gain in small volumes of the active medium in a laser based on an autowave photon-branched chain reaction

Igoshin, Valerii I; Letfullin, Renat R.

doi:10.1070/qe2000v030n12abeh001863

Cited by 3 publications

(12 citation statements)

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“…The optimal laser variant was found [2][3][4][5] to have a four-pass unstable telescopic cavity of length L = 49.5 cm, when the diameters of the mirrors are d 1 = 14 cm for the first one and d 2 = 5.98 cm for the second one, and the focal length of the second mirror is F = 53 cm. In our calculations we assumed that the cavity is filled with a high-energy-capacity working mixture, with composition H 2 :F 2 :O 2 :He = 166:334:40:210 torr, containing fine passivated aluminum particles of radius r 0 = 0.2 µm and concentration N 0 = 1.3×10 8 cm 3 .…”

Section: Diffractive Pumping Of a Pulsed H 2 -F 2 Laser Based On An Amentioning

confidence: 99%

“…[1][2][3][4][5] The mutual transformation of plane and spherical waves in the cavity, and the presence of an input control signal in the region of the coupling aperture, are taken into account by the boundary conditions (5) on the mirrors. The result is a closed system of equations, (1)-(6), describing the electrodynamics and laser-chemical processes in the active medium of a pulsed H 2 -F 2 laser-amplifier based on a PBCR in an unstable telescopic cavity.…”

Section: Diffractive Focusing Of An Input Signalmentioning

confidence: 99%

“…The calculations relating to this optical scheme of the laser can be carried out by adopting an electrodynamic approach based on the solution of the wave equation in the parabolic approximation. [2][3][4][5][6][7][8] Let us consider the case of a confocal telescopic cavity with spherical mirrors (Fig. 1).…”

Section: Diffractive Focusing Of An Input Signalmentioning

confidence: 99%

“…The screens passage factors P 1,2 (r) are approximated by exponential functions. [2][3][4][5][6][7][8] The amplifying properties of the active medium are taken into account at each iteration step h z along the path of propagation of the electromagnetic wave. This is done via the gain α, defined through…”

Section: Diffractive Focusing Of An Input Signalmentioning

confidence: 99%

“…[1][2][3][4][5] A pulse from an external IR laser source passes through a central coupling aperture in the input mirror of a cavity and it initiates a PBCR in the central zone as a result of evaporation by IR radiation of fine aluminum particles injected earlier into the active medium of the laser. The initiation can be described by the scheme:…”

Section: Introductionmentioning

confidence: 99%

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Diffractive photonic-crystal pumping of power lasers

Letfullin

Arnoldus

Foley

2003

Gas and Chemical Lasers and Intense Beam Applications IV

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In the present report a novel diffractive technique for effective optical pumping of power chemical lasers by external coherent radiation is proposed. This technique utilizes a bicomponent diffraction system coupled structurally to the unstable telescopic cavity of the laser. The space localization of the electromagnetic field inside the proposed optical scheme represents a periodic structure of diffractive maxima in the near field-zone and a narrow paraxial diffraction channel with high intensity in the far-field zone. In the Fresnel diffraction zone, the optical effect of multifocal diffractive focusing of the radiation is observed. Here the intensity in the central peaks can exceed by a factor of six (for spherical waves) to ten (for plane waves) the value of the incident wave intensity. The diffractive focusing of the input radiation opens the possibility to create a narrow diffraction initiation channel inside the laser cavity with a given space distribution and a high intensity. This technique provides a high efficiency for optical pumping and makes it possible to get a huge value of the laser energy gain. Calculations show that the ignition of laser-chemical reactions in the diffraction initiation channel under the condition of diffractive focusing of input radiation allows the laser energy to reach a gain of up to 10 9 .

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Section: Diffractive Pumping Of a Pulsed H 2 -F 2 Laser Based On An Amentioning

confidence: 99%

Section: Diffractive Focusing Of An Input Signalmentioning

confidence: 99%

Section: Diffractive Focusing Of An Input Signalmentioning

confidence: 99%

Section: Diffractive Focusing Of An Input Signalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Diffractive photonic-crystal pumping of power lasers

Letfullin

Arnoldus

Foley

2003

Gas and Chemical Lasers and Intense Beam Applications IV

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Giant energy gain in a pulsed HF laser based on a photon-branched chain reaction

Letfullin

Arnoldus

Foley

2003

Gas and Chemical Lasers and Intense Beam Applications IV

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A huge energy gain is predicted theoretically in a pulsed chemical laser-amplifier based on a photon-branched chain reaction initiated in a gaseous dispersed medium composed of H 2 -F 2 -O 2 -He and Al particles by focused external infrared radiation. It is shown that this effect is due to the possibility of ignition of the laser-chemical reaction in an initial small focal volume of the active medium. It then spreads out of this minimal volume spontaneously in the autowave regime without external power sources and subsequently fills the entire volume of the laser cavity with a high intensive electromagnetic field as self-supporting cylindrical photon-branching zones formed by the paths of the rays inside the unstable telescopic cavity. Calculations show that the ignition of an auto-wave photon-branched chain reaction under the condition of external signal focusing reduces strongly the input pulse energy necessary for initiation up to ~ 10 -8 J, and thereby allows a huge value of the energy gain of ~ 10 11 . The predicted effect of this huge laser energy gain should make it possible to construct a self-contained laser, which can be initiated by a very weak source signal.

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Laser-Induced Photon-Branched Chain Reaction in a Chemically-Active Gas-Dispersed Medium

2008

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A promising avenue in the development of high-energy pulsed chemical HF/DF lasers and amplifiers is the utilization of a photon-branched chain reaction initiated in a two-phase active medium, that is, a medium containing a laser working gas and ultradispersed passivated metal particles. These particles are evaporated under the action of IR laser radiation which results in the appearance of free atoms, their diffusion into the gas, and the development of a photon-branching chain process, which involves photons as both reactants and products. The key obstacle here is the formation of a relatively large volume (in excess of103 cm3) of the stable active medium and filling this volume homogeneously for a short time with a submicron monodisperse metal aerosol, which has specified properties. In this paper, results are presented for an extensive study of laser initiation of a photon-branched chain reaction in a gas-dispersedH2–F2medium.

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Ultrahigh energy gain in small volumes of the active medium in a laser based on an autowave photon-branched chain reaction

Cited by 3 publications

References 0 publications

Diffractive photonic-crystal pumping of power lasers

Diffractive photonic-crystal pumping of power lasers

Giant energy gain in a pulsed HF laser based on a photon-branched chain reaction

Laser-Induced Photon-Branched Chain Reaction in a Chemically-Active Gas-Dispersed Medium

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