So is there any other use to Young´s interferometer?

[windsupernova]

Other than using it to prove the particle and wave naturo of particles and of course show interference?

Or does it has some other use?

[Vanadium 50]

While I hate to use this as a source in general, see http://en.wikipedia.org/wiki/Optical_interferometry.

[Andy Resnick]

A Young-type interferometer measures the spatial coherence of a wavefront. As such, it can be used not only as a diagnostic instrument, but also, IIRC, to measure the size of stars.

[windsupernova]

Thanks for the answers