scholarly journals Chemical Intensification of Nonlinear Multi-Wave Interactions

1992 ◽  
Vol 12 (3-4) ◽  
pp. 199-209
Author(s):  
M. G. Galushkin ◽  
E. B. Gordon ◽  
M. S. Drozdov ◽  
K. A. Sviridov
Keyword(s):  
Laser Emission ◽  
Wave Mixing ◽  
Chain Reaction ◽  
Wave Interactions ◽  
Incident Flux ◽  
Laser Applications ◽  
Reactive Medium ◽  
Nonlinear Reflection ◽  
Secondary Reactions ◽  
Branched Chain

Nonlinear interaction of laser emission with a chemically reactive medium, in which a branched chain reaction may readily occur, has been analyzed aiming at essential intensification the contrast of photochemically induced phase gratings. For the model system CS2/O2, the degenerated four-wave mixing is theoretically studied under the assumption of CS2 photodissociation followed by subsequent secondary reactions induced by reactive photodissociation products. For varied CS2 concentrations and incident flux intensities, the dynamics of nonlinear reflection has been analyzed and same laser applications of such systems are suggested.

scholarly journals On the explosion of chain-thermal reactions

1982 ◽  
Vol 24 (2) ◽  
pp. 194-202 ◽  
Author(s):  
R. O. Ayeni
Keyword(s):  
Activation Energy ◽  
Asymptotic Analysis ◽  
Upper Bound ◽  
Homogeneous Model ◽  
Chain Reaction ◽  
Isothermal Reaction ◽  
Thermal Reactions ◽  
Spatially Homogeneous ◽  
Branched Chain ◽  
A Chain

AbstractA chain reaction of oxygen (reactant) and hydrogen (active intermediary) with mtrosyl chloride (sensitizer) as a catalyst may be modelled mathematically as a non-isothermal reaction. In this paper we present an asymptotic analysis of a spatially homogeneous model of a non-isothermal branched-chain reaction. Of particular interest is the so-called explosion time and we provide an upper bound for it as a function of the activation energy which can vary over all positive values. We also establish a bound on the temperature when the activation energy is finite.

scholarly journals A composite phase conjugator based on Brillouin-enhanced four-wave mixing combining with stimulated Brillouin amplification

2009 ◽  
Vol 27 (4) ◽  
pp. 681-687 ◽  
Author(s):  
C.Y. Zhu ◽  
Z.W. Lu ◽  
W.M. He
Keyword(s):  
Short Pulse ◽  
Average Power ◽  
Leading Edge ◽  
Fast Response ◽  
High Energy ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Laser Applications ◽  
Compact Structure ◽  
Stimulated Brillouin

AbstractA novel composite optical phase conjugator that combines Brillouin-enhanced four-wave mixing (BEFWM) and stimulated Brillouin amplification (SBA) in a compact structure is reported. A phase-conjugate wave seed is generated by BEFWM process with characteristics such as fast response, high conjugate fidelity and stability, then it is magnified by SBA with high energy-conversion efficiency. As a result, advantages of BEFWM and SBS can be realized at the same time. This composite conjugator has potentials for high-peak and high-average power laser applications, especially for short pulse or steep leading-edge pulse laser systems. Feasibility of this BEFWM-SBA mechanism is verified in theoretical simulations and demo experiments.

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

2008 ◽  
Vol 2008 ◽  
pp. 1-10
Author(s):  
Renat R. Letfullin ◽  
Thomas F. George ◽  
Galen C. Duree
Keyword(s):  
Active Medium ◽  
High Energy ◽  
Extensive Study ◽  
Chain Process ◽  
Chain Reaction ◽  
Two Phase ◽  
Dispersed Medium ◽  
Branched Chain ◽  
Short Time ◽  
Promising Avenue

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 of 103 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-dispersed H2–F2 medium.

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