Thermally excited CO<sub>2</sub>cascade lasers

Biryukov, A. S.; Karakhanova, I V; Konoplev, N. A.; Shcheglov, V. A.

doi:10.1070/qe1983v013n12abeh005024

Cited by 2 publications

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“…Theoretical gain optimization versus the nozzle shape has been carried out by several investigators [1][2][3][4][5][6][7][8][9][10][11]. Losev and Makarov [2] have considered a planar wedge nozzle shape of…”

Section: Introductionmentioning

confidence: 99%

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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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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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Section: Introductionmentioning

confidence: 99%

“…Reddy and Shanmugasundaram [5][6][7] used nozzles deÿned by a(z) = (1 + z j ) i where i and j are positive integer numbers. Biryukov et al [8] carried their optimization for the nozzle proÿle a(z) = 1 + a log(bz + 1) for 06z6l 1 + a log(bl + 1) for l6z6L…”

Section: Introductionmentioning

confidence: 99%