Characteristics Of C   6   H   6   -O   2   -N   2    Type CO   2    Gasdynamic Laser

SUMMARYIn this paper a simpliÿed quasi-two-dimensional model for small signal gain optimization in gasdynamic laser is introduced. In order to obtain a homogeneous medium with maximum optical gain in the active medium, by nozzle shape formation, the shock occurrence position is controlled and is postponed to some point behind the laser active medium. Then the method of calculus of variation is used to ÿnd the supersonic part of the nozzle of a gasdynamic laser with maximum gain in the active medium. The interesting result is that the supersonic part of such a nozzle consists of a wedge as the accelerating part of the nozzle, a smooth surface for the uniformization, and ÿnally a channel for the relaxation of the medium. (The middle section is characterized as the geometrical locus of points whose characteristic curves are concurrent at a certain point.) It is also shown that, overlooking a minor di erence in the gain, the nozzle can be chosen to be a shock free one with the ultimate optical uniformity.

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A simplified quasi‐two‐dimensional model for gain optimization in carbon dioxide gasdynamic lasers (GDL)

Bahrampour

Farrahi

Radjabalipour

2002

Numerical Methods in Fluids

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A New Kinetic Model for Assessing the Performance of Advanced CO₂ Gasdynamic Lasers

Ebina¹,

Yokozawa²,

Yamaguchi³

et al. 1994

Jpn. J. Appl. Phys.

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A theoretical analysis of CO2 gasdynamic laser ( CO2-GDL) performance using a six-temperature model is described in this paper. This model has specifically included vibrational transfer processes associated with vibrational non equilibrium of O2 and H2O so that the kinetic behaviors of these species in an active laser medium can be properly assessed. The calculation carried out with this model showed that presence of O2 in the laser medium together with H2O reduces the population inversion. Consequently, under the condition where the concentration of H2O was ∼4 mol%, every additional percent of O2 was found to be about one percent reduction in the small signal gain of a CO2-GDL. The calculation resulted in good agreement with experimental studies in the variation of the small signal gains as well as vibrational temperatures for various laser gas composition.

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Characteristics Of C 6 H 6 -O 2 -N 2 Type CO 2 Gasdynamic Laser

Cited by 2 publications

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A simplified quasi‐two‐dimensional model for gain optimization in carbon dioxide gasdynamic lasers (GDL)

A simplified quasi‐two‐dimensional model for gain optimization in carbon dioxide gasdynamic lasers (GDL)

A New Kinetic Model for Assessing the Performance of Advanced CO₂ Gasdynamic Lasers

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Characteristics Of C 6 H 6 -O 2 -N 2 Type CO 2 Gasdynamic Laser

Cited by 2 publications

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A simplified quasi‐two‐dimensional model for gain optimization in carbon dioxide gasdynamic lasers (GDL)

A simplified quasi‐two‐dimensional model for gain optimization in carbon dioxide gasdynamic lasers (GDL)

A New Kinetic Model for Assessing the Performance of Advanced CO2 Gasdynamic Lasers

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Product

Resources

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A New Kinetic Model for Assessing the Performance of Advanced CO₂ Gasdynamic Lasers