Correction and correlation formation of probing field in fiber laser Doppler anemometers and vibrometers

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

doi:10.1016/s0143-8166(00)00005-1

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The Theoretical Background Of the Methods1

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2003

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“…{P(x2,y2).Af(x2,y2)}* -{s} (2) Applying the convolution theorem, the field distribution in the back focal plane of correlator can be represented by relation: W(x3 ,y3) z{u} = QM* p M ® S where * and 0 are correlation and convolution operators respectively. The exact form of amplitude distribution of output field of such two-stage correlator has been derived in [5] for the case of periodical phase distribution of wave Q.…”

Section: The Theoretical Background Of the Methodsmentioning

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: The Theoretical Background Of the Methodsmentioning

confidence: 99%