Reversal of wavefronts of nanosecond and microsecond laser radiation pulses in fiber waveguides

Kotel'nikova, V G; Chertkov, A.A.

doi:10.1070/qe1985v015n04abeh006981

Sov. J. Quantum Electron.

1985

DOI: 10.1070/qe1985v015n04abeh006981

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Reversal of wavefronts of nanosecond and microsecond laser radiation pulses in fiber waveguides

V G Kotel'nikova¹,

A.A. Chertkov²

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1986

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Dependence of the quality of wavefront reversal by stimulated scattering in a fiber waveguide on the coupling-in conditions

Krivoshchekov¹,

Pilipetskiǐ²,

Shkunov³

1986

Sov. J. Quantum Electron.

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There have been a number of small contradictions in reports of the structure of the recently discovered thallium superconducting materials, in particular the phase TI,Ba,Ca,Cu,O,, hereafter abbreviated to 2223. The structure has been reported to be pseudo-tetragonal or 14/mmm with a c axis of 3.625, 3.61 or 3.59 nm, and an a axis of 0.54, 0.547 or 0.385 nm. We report here results obtained by high-resolution electron microscopy and diffraction which show that these results are not inconsistent with each other. The a axis is around 0.385 nm, and the cia axis ratio and the experimental images are genuinely variable, which we suspect is due to variations in the oxygen stoichiometry. The earlier reports of an a axis of 0.547 nm are due to loss of symmetry caused by intergrowths. We also report evidence for polytypism based around half unit cell blocks involving the local stoichiometries . In all these materials the a axis appears to remain the same but there is a small systematic contraction in the local Cu-Ca-Cu perovskite spacing along the c axis as the number of perovskite units increases, which we suggest could be linked to the superconducting transition temperature.

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Dependence of the quality of wavefront reversal by stimulated scattering in a fiber waveguide on the coupling-in conditions

Krivoshchekov¹,

Pilipetskiǐ²,

Shkunov³

1986

Sov. J. Quantum Electron.

View full text Add to dashboard Cite

show abstract

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Reversal of wavefronts of nanosecond and microsecond laser radiation pulses in fiber waveguides

Cited by 1 publication

References 0 publications

Dependence of the quality of wavefront reversal by stimulated scattering in a fiber waveguide on the coupling-in conditions

Dependence of the quality of wavefront reversal by stimulated scattering in a fiber waveguide on the coupling-in conditions

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