Improved method for estimating the minimum length of modal filters fabricated for stellar interferometry.
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.
Dasgupta
Sonali
S
Optoelectronics Research Center, University of Southampton, United Kingdom. sxd@orc.soton.ac.uk
Broderick
N G R
NG
Richardson
David J
DJ
Lewi
Tomer
T
Katzir
Abraham
A