ABSTRACT
High-resolution imaging is an essential requirement in many
scientific applications. However, detection of a celestial object in
the presence of atmospheric turbulence (see Section 1.5.3) is
a difficult task, more so, in the case of spatial interferometry
(Labeyrie, 1975, 1986; Labeyrie et al., 2006; Saha, 2002, 2010,
and references therein) in particular, since the interference fringes
must be gathered within a few milliseconds, or the source would
move from the field-of-view (FOV). Such an interferometry requires
detection of very faint signals and reproduction of interferometric
visibilities to high precision and, therefore, demands detectors and
electronics with extremely low noise.