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.