Constraints on Jupiters from Observations of Galactic bulge microlensing events during 2000

Peer reviewe

Double passage imaging of an arbitrary object through turbulence - Experimental results

Experimental results for the double passage imaging of an optically rough object are presented. The approach is based on a confocal arrangement using two coherent, focused beams and polarization manipulation. An appreciable improvement in image quality is achieved compared to passive imaging systems

Measurements of the four-point coherence function by the use of the coherence enhancement phenomenon

We present laboratory results for measurements of the four-point coherence function of a spherical wave in the region of coherence enhancement after backscattering through turbulence. Experimental results are compared with the theoretical predictions. We conclude that the shape of the four-point coherence function in our experiment depends on the value of the inner scale of turbulence

Profiling of atmospheric turbulence strength and velocity using a generalised SCIDAR technique

The measurement of the strength and velocity of atmospheric optical turbulence using a generalised SCIDAR technique is outlined and demonstrated. This method allows the full turbulent profile to be characterised from the telescope pupil up to any desired altitude. A number of example profiles from various astronomical observing sites are presented

Measurements of the four-point coherence function using the coherence enhancement phenomenon

Experimental observations of the coherence enhancement phenomenon are presented and described. We have illuminated an optically rough moving target through turbulence using two mutually coherent point sources and observed the interference of the scattered fields in the region close to the sources (the region of coherence enhancement) with the help of a special interferometric system. The experiment was carried out under weak and strong intensity fluctuations on the object. Our study shows that the intensity distribution in the region of coherence enhancement is determined by the four-point correlation function and depends on the inner scale of the turbulence