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Updated: Jun 26, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Improved method for estimating the minimum length of modal filters fabricated for stellar interferometry
Sonali Dasgupta1, N G R Broderick, David J Richardson
1Optoelectronics Research Center, University of Southampton, United Kingdom. sxd@orc.soton.ac.uk
Abstract:
We present an improved theoretical model to estimate the minimum fiber length required for achieving a desired degree of wavefront filtering in stellar interferometry. The proposed model is based on modal analysis of the fiber and is compared with numerical results obtained through the beam propagation method as well as with reported experimental observations. We also study the effect of introducing a spatial filter at the output end of the fiber and show that the required fiber length can be reduced significantly by introducing a circular aperture of optimum radius after the fiber.
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