Diffractive focusing of an input pulse and giant energy gain in a laser based on an auto-wave photon-branched network

Gas and Chemical Lasers and Intense Beam Applications IV

Arnoldus

Foley

2003

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 .

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

Gas and Chemical Lasers and Intense Beam Applications IV

Arnoldus

Foley

2003

Theory of energy gain in a laser-amplifier based on a photon-branched chain reaction: Auto-wave amplification mode under the condition of input signal focusing

Journal of Applied Physics

George

2000

Huge energy gain is detected theoretically in a pulsed chemical laser amplifier based on a photon-branched chain reaction initiating in a gaseous disperse medium composed of H2-F2-O2-He and Al particles by focused external infrared radiation. It is shown that this effect is observed due to the possibility of the ignition of the laser–chemical reaction into an initial small focal volume of an active medium. It then spreads out of this minimal volume spontaneously in the auto-wave regime without external power sources and subsequently fills the whole 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 strongly reduces the input pulse energy necessary for initiation up to ∼10−8 J, and thereby allows a huge value of the energy gain of ∼1011. The observed effect of this huge laser energy gain makes it possible to construct a self-contained laser with kilojoule output energy, which can be initiated by a very weak source signal.

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

Gas and Chemical Lasers and Intense Beam Applications IV

Arnoldus

Foley

2003

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.