Computer modeling and experimental study of non-chain pulsed electric-discharge DF laser

Abstract

Computer simulation and experimental study of a pulsed electrical-discharge DF laser pumped by the SF(6)-D(2) non-chain reaction are presented. The computer model encompassing 28 reactions is based on laser rate equations theory, and applied to approximately describe the chemical processes of non-chain DF laser. A comprehensive study of the dependence of number density on time for all particles in the gain area is conducted by numerical calculation adopting Runge-Kutta method. The output performance of non-chain pulsed DF laser as a function of the output mirror reflectivity and the mixture ratio are analyzed. The calculation results are compared with experimental data, showing good agreement with each other. Both the theoretical analysis and experimental results present that the laser output performance can be improved by optimizing the mixture ratio and output mirror reflectivity. The optimum values of mixture ratio and output mirror reflectivity are respectively 10:1 and 30%. The single pulse energy of 4.95J, pulse duration of 148.8ns and peak power of 33.27 MW are achieved under the optimum conditions.

Self-sustained volume discharge in mixtures of SF6 with hydrocarbons, hydrogen and deuterium for non-chain HF(DF) lasers

“…It was found that, if there is a small-scale inhomogeneity ~50 µm at the cathode surface, an SSVD can develop in SF 6 and SF 6 -based mixtures in the form of a self-initiated volume discharge (SIVD) with its uniform character preserved even in the case of the discharge gaps possessing a high edge electric field enhancement [39]. All SIVD characteristics in SF 6 (form, current and voltage oscillograms) are identical to those of the SSVD triggered by UV [39,40] and x-ray preionization [41].…”

Pulse energy sustainability of a burst mode closed-cycle pulsed HF chemical laser

“…The chemical reaction process of a non-chain HF laser is very complicated. Here, we only consider the following major processes [26,27],…”

Theoretical study of the characteristics of a continuous wave iron-doped ZnSe laser

“…Also in 2015, Martyshkin reported a repetition rate Fe 2+ :ZnSe laser with a maximum average power of 35 W at 77 K [6]. Both the flash-lamp-pumped Er:YAG laser and the non-chain pulsed HF/DF laser pump source have the disadvantages of large volume and low wall-plug efficiency [11,12]. However, solid state continuous-wave Fe 2+ :ZnSe lasers using an LD pumped Er:YAG laser as the excitation source have the advantages of compact size and high wall-plug efficiency, which would have prospects in the future.…”