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Journal Article

Experimental reconstruction of spatial Schmidt modes for a wide-field SU(1,1) interferometer

MPS-Authors

Frascella,  Gaetano
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nuremberg;

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Chekhova,  Maria
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nuremberg;
Physics Department, Lomonosov Moscow State University;

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Citation

Frascella, G., Zakharov, R. V., Tikhonova, O. V., & Chekhova, M. (2019). Experimental reconstruction of spatial Schmidt modes for a wide-field SU(1,1) interferometer. Laser Physics. doi:10.1088/1555-6611/ab4bdc.


Cite as: https://hdl.handle.net/21.11116/0000-0005-0FEB-3
Abstract
We study the spatial mode content at the output of a wide-field SU(1, 1) interferometer, i.e. a nonlinear interferometer comprising two coherently-pumped spatially-multimode optical parametric amplifiers placed in sequence with a focusing element in between. This device is expected to provide a phase sensitivity below the shot-noise limit for multiple modes over
a broad angular range. To reconstruct the spatial modes and their weights, we implement
a simple method based on the acquisition of only intensity distributions. The eigenmode decomposition of the field is obtained through the measurement of the covariance of intensities at different spatial points. We investigate both the radial and azimuthal (orbital angular momentum) modes and show that their total number is large enough to enable applications of the interferometer in spatially-resolved phase measurements.