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Gasdynamic light guide: high power density transmission measurements

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Abstract

The refractive-index gradients in the gas flow in a radial flow convergent–divergent nozzle whose throat lies on the arc of a circle can create, in the neighborhood of the throat, a region capable of trapping and guiding light. Such a device, with a deflection angle of 90° and a throat radius of 7.6 cm, was investigated. The working gas was nitrogen at supply pressures of 30–100 atm. The transmission characteristics of the device at light power densities up to 3 × 108 W/cm2 were measured. No reduction in transmission attributable to high power densities was found up to levels of 3 × 108 W/cm2 at the beam focus at input of the device, equivalent to an average level over the light guiding region of 107 W/cm2. The maximum measured transmission of the device at the maximum power density was 99.8 ± 1.0%.

© 1980 Optical Society of America

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Corrections

David W. Bogdanoff, "Gasdynamic light guide: high power density transmission measurements; errata," Appl. Opt. 20, 381_1-381 (1981)
https://opg.optica.org/ao/abstract.cfm?uri=ao-20-3-381_1

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