Correlation synthesis of a probe field in laser Doppler velocimeters with multimode fiber waveguides

Gnatovskii, A. V.; Medved, N. V.; Khotyaintsev, S. N.; Yarovoi, Leonid K.

doi:10.1070/qe1990v020n02abeh004819

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2003

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“…Such modulator can not have zero diffraction order, that provides increasing efficiency. We used two-dimensional phase modulators kind of M(x) .M(y), where M(x) is defined by (4). The phase modulator was made by photographing the amplitude mask (see fig.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Axial intensity increase of light passing through multimode fiber by two-stage correlation method

Yarovoi

Gnatovskiy²,

Medved³

2003

SPIE Proceedings

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The paper reports the results of light beams transformation at multimode fibers exit to increase axial light intensity. It is achieved by smoothing of the output wavefront. To eliminate wavefront inhomogeneity we used two-stage correlation method of laser beams transformation. The main elements of two-stage correlation system are the spatial modulator and the hologram. The effect of the two-stage system both on laser modes and on output fields of the multimode fiber were simulated and experimentally studied. The investigation has established that considerable increase of the axial intensity is achieved for the fields having modes contents which is similar to the mode contents at the hologram recording stages. At the same time, the intensity increase is actualized for wide set ofthe specific field distributions at the input of system.

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Section: Experimental Setup and Resultsmentioning

confidence: 99%